How to Say "senseless" in Spanish
The most common Spanish word for “senseless” is “inconsciente” — use 'inconsciente' when referring to someone who has lost consciousness, usually due to an injury or medical event.
inconsciente
in-kon-syén-teiŋkonˈsjente

Examples
El boxeador quedó inconsciente después del golpe.
The boxer was left unconscious after the blow.
Después del accidente, el conductor quedó inconsciente por unos minutos.
After the accident, the driver remained unconscious for a few minutes.
Ella fue completamente inconsciente del peligro que corría.
She was completely unaware of the danger she was running.
Fue un error inconsciente; no quise ofender a nadie.
It was an unconscious (unintentional) mistake; I didn't mean to offend anyone.
Always Stays the Same
Unlike most adjectives, 'inconsciente' doesn't change based on gender (it's used for both masculine and feminine nouns). It only changes to plural: 'inconscientes'.
Ser vs. Estar
Use 'estar' (to be) to talk about the temporary state of being knocked out: 'El paciente está inconsciente.' Use 'ser' (to be) less often, usually for describing a person's general lack of awareness.
Accidentally Changing Gender
Mistake: “La mujer inconscienta.”
Correction: La mujer inconsciente. Remember, this adjective doesn't end in -o/-a, so it doesn't change its ending for gender.
irracional
ee-rra-syo-NAHLiraθjoˈnal

Examples
Fue una decisión irracional gastar todo el dinero en un solo día.
It was a senseless decision to spend all the money in one day.
Tengo un miedo irracional a las arañas.
I have an irrational fear of spiders.
Fue una decisión irracional tomada bajo presión.
It was an irrational decision made under pressure.
No intentes razonar con él cuando está tan irracional.
Don't try to reason with him when he's being so irrational.
One Form for Everyone
This word doesn't change its ending for men or women. Whether you describe a 'hombre' or a 'mujer', it's always 'irracional'.
Making it Plural
To talk about more than one thing, simply add '-es' at the end: 'irracionales'. This is a standard rule for Spanish words ending in the letter 'l'.
The 'Irracionala' Error
Mistake: “La idea es irracionala.”
Correction: La idea es irracional. Words ending in 'l' in Spanish almost never change to 'a' for feminine things.
Unconscious vs. Lacking Logic
Related Translations
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