How Do You Say The Boys Are Serious In Spanish? | Say It

The cleanest line is “Los chicos están serios,” using estar for a mood or tone you’re seeing right now.

You’ve got a simple English sentence, and Spanish gives you a few choices that can shift the meaning. That’s the whole trick.

“The boys are serious” can mean the boys look stern, the boys aren’t joking, or the boys tend to be serious people. Spanish marks those differences with the verb, the adjective, and sometimes a short idiom.

What “Serious” Means In This Sentence

Before you pick Spanish words, pin down what you mean in English. “Serious” is one of those adjectives that slides around.

• Stern or unsmiling right now: their faces, tone, or posture look grave.
• Not joking: they mean what they said; it’s not banter.
• Serious by nature: a steady personality trait.
• Serious about something: they take a task or topic seriously.

Spanish can express each idea cleanly. The right pick makes you sound natural, not stiff.

Saying The Boys Are Serious In Spanish With Ser And Estar

Most learners stumble here: Spanish often uses estar for a state you’re observing and ser for a trait you’re assigning. That split shows up a lot with adjectives like serio.

If you’re talking about what you see in the moment—faces set, voices low—use estar. If you’re describing the boys as the kind of people who act responsibly and rarely clown around, use ser.

The Real Academia Española explains how ser and estar behave with attributes, including the general difference between classifying someone and describing a situation-bound state. RAE grammar note on attributes with ser and estar spells out that contrast in plain terms.

Option A: They Look Serious Right Now

Los chicos están serios.

This is the direct, everyday way to say the boys look serious right now. It fits a classroom moment, a team talk, a tense scene at home—any time you’re reading the room.

If you want to lean into “stern,” you can add a small detail after it:

• Los chicos están serios, con la cara larga. (They look serious, a bit down.)
• Los chicos están serios; nadie se ríe. (They look serious; no one’s laughing.)

Option B: They Are Serious People

Los chicos son serios.

This describes a general tendency: they’re the type who act sober, responsible, or formal. It can sound like praise in one setting and like mild criticism in another, so your tone does a lot of the work.

If you want “serious” as in “reliable” or “responsible,” Spanish often keeps serio and lets context do the rest. Dictionaries also connect serio with reliability and a no-nonsense attitude; see Cambridge’s entry for “serio” for that sense.

Saying They’re Serious About What They Said

Sometimes “The boys are serious” means “They mean it.” In Spanish, you’ll often use a short phrase with en serio or a verb that signals intention.

Option C: They’re Not Joking

Los chicos van en serio.

This is a punchy way to say the boys are serious about it, not playing around. You’ll hear it in debates, negotiations, and moments when someone wants to be taken at face value.

You can also say:

• Los chicos hablan en serio. (They’re speaking seriously.)
• Los chicos lo dicen en serio. (They mean what they’re saying.)

Option D: They Take It Seriously

Los chicos se lo toman en serio.

This targets “serious about a task.” It works with schoolwork, training, chores, or any responsibility.

Swap in the topic to make it tighter:

• Los chicos se toman el partido en serio.
• Los chicos se toman el examen en serio.

When you use serio as an adjective, it helps to know what Spanish counts as “serious.” The RAE dictionary definition includes senses like “grave” and “severo en el semblante.” RAE’s dictionary entry for “serio, ria” is a handy check when you’re matching tone.

Common Translations Side By Side

Use this table when you’re deciding between mood, personality, and intent. The Spanish lines are natural in many regions, with notes where they tilt one way or another.

Spanish Phrase	Best Fit In English	When It Sounds Right
Los chicos están serios.	The boys look serious.	You’re reacting to what you see right now.
Los chicos son serios.	The boys are serious people.	You’re describing their usual style or character.
Los chicos van en serio.	The boys mean it.	You want “not joking” in a firm, casual way.
Los chicos hablan en serio.	The boys are speaking seriously.	You’re judging their tone in a conversation.
Los chicos lo dicen en serio.	The boys are serious about what they said.	Someone doubts them, and you’re backing them up.
Los chicos se lo toman en serio.	The boys take it seriously.	The focus is effort or responsibility.
Los chicos están muy serios.	The boys look so serious.	You want to intensify the mood without adding extra words.
Los chicos están serios y callados.	The boys are serious and quiet.	You’re painting a fuller picture of the room.

Notice what changes: estar points to a state, ser points to a trait, and en serio points to intent. The RAE’s usage note on estar explains that it often marks a quality seen as tied to a situation or a change. RAE “estar” note in the Diccionario panhispánico de dudas is clear and practical.

Pick The Word For “Boys” That Fits Your Setting

English “boys” is broad. Spanish gives you a menu, and the choice can change the vibe. If you’re writing, it’s worth choosing on purpose.

Chicos: The Safe Default

Chicos works for boys in most countries and age ranges, from school kids to young men in a group. If you’re unsure, start here.

Niños: Younger Kids

Niños points to children. If the boys are little, this reads more precise than chicos.

Muchachos: Teens Or Young Men

Muchachos often fits teens or young men. It can sound friendly. In some places it can also mean “guys” in a broad sense.

Chavales: Common In Spain

Chavales is common in Spain for boys or teens. If your audience is Spanish (Spain), it can sound right at home.

Swap these into the core lines as needed:

• Los muchachos están serios.
• Los niños están serios.
• Los chavales van en serio.

Make It Match Real Speech

Spanish is picky about agreement and word order, but you don’t need fancy grammar to get this line right. A couple of small habits help.

Keep The Adjective After The Noun

With serio, the normal order is noun + adjective: chicos serios. Putting it before the noun can sound literary or carry a different shade. Stick with the usual pattern in everyday writing.

Use “Están Serios” When You Mean Faces And Tone

If you can picture their expressions, están serios is the go-to. It’s also a neat way to describe a sudden shift: laughing a second ago, quiet now.

Add A Reason If The Listener Might Wonder

English often leaves the reason unstated. Spanish can too, but one short clause can make the moment feel real:

• Los chicos están serios porque pasó algo.
• Los chicos están serios desde que llegó el entrenador.

Agreement Check With Real Sentences

Here are clean templates you can copy and adjust. They show singular vs. plural and how serio changes with gender and number.

Spanish	Natural English	Small Note
El chico está serio.	The boy looks serious.	One boy, mood right now.
Los chicos están serios.	The boys look serious.	Group mood right now.
La chica está seria.	The girl looks serious.	Feminine singular: seria.
Las chicas están serias.	The girls look serious.	Feminine plural: serias.
Los chicos son serios.	The boys are serious people.	Trait or general description.
Los chicos van en serio.	The boys mean it.	Intent, not mood.
Los chicos se lo toman en serio.	The boys take it seriously.	Effort and attitude to a task.

Little Traps That Change The Meaning

A few near-misses can make your sentence sound odd, or just say something else.

“Están Serios” Vs. “Están En Serio”

Están serios describes how they look or act. Van en serio or lo dicen en serio says they’re not joking. Están en serio can appear in some speech, but it’s less standard and can sound off in writing.

“Son Serios” Can Sound Like A Label

When you say son serios, you’re tagging them as serious by nature. If that’s not what you mean, switch to están serios. The swap is small; the message changes a lot.

“Serio” Is Not Always “Severe”

Serio can mean grave, stern, reliable, or formal depending on context. If you mean “strict,” you may add a clarifier: serios y estrictos. If you mean “down,” you might pair it with tristes or preocupados when that’s the real point.

Use This Mini Script In Conversation

If you’re speaking and you want a line that works in most situations, try this flow. It keeps you from picking the wrong meaning.

1. Start with the mood: Los chicos están serios.
2. If someone asks “Why?” add a short reason: …porque el tema es delicado.
3. If you mean “they mean it,” switch verbs: Van en serio.

It’s simple, and it sounds like something a native speaker would say.

Final Pick Based On Your Intended Meaning

If you want a single answer to copy into a message, choose one of these three and you’ll land in the right place:

• Los chicos están serios. (They look serious right now.)
• Los chicos son serios. (They tend to be serious people.)
• Los chicos van en serio. (They mean it; they’re not joking.)

Once you know which English meaning you meant, Spanish stops feeling tricky here. It becomes a clean, confident choice.