adj.

1. Marked by a lack of responsibility: irresponsible accusations.
2. Lacking a sense of responsibility; unreliable or untrustworthy.
3. Law. Not mentally or financially fit to assume responsibility.
4. Not liable to be called to account by a higher authority.

n.

1. One who has no sense of responsibility.
2. Law. One who is mentally or financially unfit to assume responsibility for one's actions.
3. One who is unlikely to be called to account by a higher authority.

irresponsibility ir're·spon'si·bil'i·ty or ir're·spon'si·ble·ness n.
irresponsibly ir're·spon'si·bly adv.

adjective

Lacking or marked by a lack of care: careless, feckless, heedless, inattentive, reckless, thoughtless, unconcerned, unmindful, unthinking. See careful/careless.

adj

Definition: careless, reckless
Antonyms: accountable, careful, liable, reliable, responsible, trustworthy

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IN BRIEF: Not upholding one's duty, careless.

People like pets to possess the same qualities they do. Cats are irresponsible and recognize no authority, yet are completely dependent on others for their material needs. — P.J. O'Rourke (1947-) American humorist & journalist

Dansk (Danish)
adj. - uansvarlig, letsindig, ansvarsløs
n. - uansvarlig person

Nederlands (Dutch)
onverantwoordelijk, ontoerekenbaar

Français (French)
adj. - irresponsable, étourdi, irréfléchi, (Jur) irresponsable
n. - irresponsable

Deutsch (German)
adj. - unverantwortlich, verantwortungslos
n. - verantwortungslose Person

Ελληνική (Greek)
adj. - απερίσκεπτος, ελαφρόμυαλος, ανεύθυνος

Italiano (Italian)
irresponsabile

Português (Portuguese)
adj. - irresponsável

Русский (Russian)
безответственный, невменяемый

Español (Spanish)
adj. - irresponsable, irreflexivo, poco serio
n. - irresponsable, irreflexivo

Svenska (Swedish)
adj. - oansvarig, otillräknelig, ovederhäftig

中文（简体） (Chinese (Simplified))
不负责任的, 不可靠的, 不承担责任的人, 无责任感的人

中文（繁體） (Chinese (Traditional))
adj. - 不負責任的, 不可靠的
n. - 不承擔責任的人, 無責任感的人

한국어 (Korean)
adj. - 책임이 없는
n. - 책임감이 없는 사람

日本語 (Japanese)
adj. - 無責任な, 責任のない

العربيه (Arabic)
‏(صفه) تعوزه المسؤوليه, غير قادر على تحمل المسؤوليه‏

עברית (Hebrew)
adj. - ‮נעשה בצורה בלתי-אחראית, בלתי אחראי‬
n. - ‮אדם לא-אחראי‬

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