How to say "negligent" in Japanese

Choosing the right word
  • おろそかJLPT N1approx.Common
    na-adjectiveA common word for negligent in the sense of neglectful or remiss: failing to give work, duties, or one's health the attention they deserve. The nuance is carelessness through inattention rather than deliberate refusal.
    学業がくぎょうをおろそかにするなんて、君きみはばかだ。↗
    It is silly of you to neglect your studies.
  • 投げやりなげやり
    na-adjective, nounCovers negligent as an attitude: doing a task in an offhand, throwaway manner because you have stopped caring about the result. Think slipshod, slovenly work rather than simple oversight.
    彼かれはこの頃ごろ研究けんきゅうを投なげやりにしている。↗
    He is neglecting his research these days.
  • na-adjectiveA less common near-synonym of おろそか, covering the same sense of treating something as unimportant and failing to give it due attention. For everyday use, おろそか is the word to reach for.
  • 杜漏ずろう
    na-adjective, nounA rare word meaning careless or negligent; in practice it is seldom the word you want, and おろそか is the common choice for ordinary contexts.
  • 忘れがちわすれがち
    na-adjective, no-adjectiveEssentially forgetful or apt to forget: it fits negligent only where the negligence consists of tending to forget things, not in the general sense of careless or neglectful conduct.

Use 「おろそか」 as the default for failing to give something the attention it deserves; 「投げやり」 adds an offhand, slipshod attitude; 「ゆるがせ」 is a less common near-synonym; 杜漏 is rare; 「忘れがち」 covers only forgetfulness-based neglect.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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