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irresponsible (adj.)

1640s, "not legally answerable for conduct or actions," from assimilated form of in- (1) "not, opposite of" + responsible. Meaning "not acting with a sense of responsibility" is from 1680s. Related: Irresponsibly.

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Definitions of irresponsible from WordNet

irresponsible (adj.)
showing lack of care for consequences;
behaved like an irresponsible idiot
hasty and irresponsible action
From wordnet.princeton.edu