Usage Note
Irresponsable is invariable for gender (un geste irresponsable / une décision irresponsable). It can refer to a person or an action. The noun irresponsabilité covers both legal irresponsibility (e.g. a minor) and moral recklessness. In legal contexts it may mean 'not legally liable'.
Examples
"C'est irresponsable de conduire sans ceinture."
Natural Translation
It is irresponsible to drive without a seatbelt.
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