Inklingo

How to Say "serious" in Spanish

The most common Spanish word for “serious” is “serio” — use 'serio' to describe a person's personality or mood when they are not joking or smiling, or to indicate something is important and not trivial.

English → Spanish

serio

seh-ryohˈse.ɾjo

adjectiveA2/B1general
Use 'serio' to describe a person's personality or mood when they are not joking or smiling, or to indicate something is important and not trivial.
A portrait of a mature man wearing formal attire, sitting upright with his hands clasped. He has a perfectly straight mouth and a neutral, unsmiling expression, conveying a serious mood.

Examples

Mi profesor de historia es muy serio, casi nunca se ríe.

My history teacher is very serious, he almost never laughs.

Ponte serio, estamos hablando de algo importante.

Get serious, we're talking about something important.

Aunque parece serio, en realidad es muy amable.

Although he seems serious, he's actually very kind.

La falta de agua es un problema serio en esta región.

The lack of water is a serious problem in this region.

Matches the Person or Thing It Describes

Like most describing words in Spanish, 'serio' changes to match the gender and number of what it's describing: 'el hombre serio' (the serious man), 'la mujer seria' (the serious woman), 'los niños serios' (the serious children), 'las niñas serias' (the serious girls).

Using 'Ser' vs. 'Estar'

Mistake: “Confusing 'ser serio' and 'estar serio'.”

Correction: Use 'ser serio' to describe someone's personality (it's who they are). Use 'estar serio' to describe someone's current mood (it's how they are right now). 'Él es serio' (He is a serious person). 'Él está serio' (He is being serious at this moment).

grave

GRAH-vehˈɡɾa.βe

adjectiveB1general
Use 'grave' for serious situations, illnesses, or consequences that have significant negative implications.
A storybook illustration showing a doctor with a deeply serious and concerned expression on their face, representing a grave situation.

Examples

Su estado de salud es grave, necesita un médico inmediatamente.

His health condition is serious; he needs a doctor immediately.

Cometer un error tan grave en el informe afectará tu ascenso.

Making such a serious mistake in the report will affect your promotion.

El presidente dio un discurso con tono grave sobre la crisis económica.

The president gave a speech in a solemn tone about the economic crisis.

Always Use the Same Form

The form 'grave' is used for both masculine and feminine nouns (e.g., 'el error grave,' 'la lesión grave'). Only the plural changes: 'graves.'

Don't Confuse with 'Heavy'

Mistake: “Using 'grave' to mean physically heavy (like a heavy box).”

Correction: Use 'pesado/a' for physical weight. 'Grave' implies emotional weight or severity.

crítico

adjectiveB2general
Use 'crítico' when referring to a condition or state that is extremely dangerous or at a turning point, often in a medical context.

Examples

El paciente fue ingresado en estado crítico.

The patient was admitted in critical condition.

formal

for-MAHLfoɾˈmal

adjectiveB1general
Use 'formal' to describe someone's character or demeanor as serious, respectable, and dependable, rather than frivolous.
A storybook illustration of a person sitting upright at a desk, looking directly ahead with a serious, composed expression, illustrating a serious demeanor.

Examples

Mi jefe es una persona muy formal, siempre cumple su palabra.

My boss is a very dependable person; he always keeps his word.

Necesitamos un socio comercial que sea formal y comprometido.

We need a business partner who is serious and committed.

profundo

proh-FOON-dohpɾoˈfundo

adjectiveB2general
Use 'profundo' to describe a serious analysis, study, or impression that is deep, thorough, or significant.
A single, large, brown owl sitting very still on a thick branch, looking contemplative and serious.

Examples

Su discurso causó una profunda impresión en la audiencia.

His speech made a profound impression on the audience.

El libro explora temas filosóficos muy profundos.

The book explores very deep philosophical themes.

Use with 'Ser'

Since 'profundo' describes an inherent quality (how serious or meaningful something is), it almost always uses the verb 'ser': 'La tristeza es profunda' (The sadness is profound).

Confusing 'Serio' vs. 'Grave'

Learners often confuse 'serio' and 'grave'. Remember that 'serio' is generally used for personality or importance (a serious person, a serious problem), while 'grave' is reserved for critical situations, illnesses, or consequences with severe negative outcomes.

Related Translations

Learn Spanish with Inklingo

Interactive stories, personalized learning, and more.