How to Say "irresponsible person" in Spanish
The Spanish word for “irresponsible person” is “irresponsable” — B1 level.
English → SpanishB1
nounB1
someone who lacks responsibility

Examples
Ese tipo es un irresponsable.
That guy is an irresponsible person.
Los irresponsables que tiraron basura serán multados.
The irresponsible people who littered will be fined.
Turning descriptions into people
In Spanish, you can turn many adjectives into nouns just by adding 'un', 'una', 'el', or 'la' in front of them.
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