不注意|ふちゅういfuchuui[2]nakadaka (mid-high)

1. noun, na-adjectivecarelessness; inattention; thoughtlessness; negligence
   そんな不注意ふちゅういな間違まちがいをしてはいけません。↗

   Don't make such careless mistakes.

• SynonymそそっかしいCasualColloquial: a hasty, scatterbrained nature prone to careless errors; 「不注意」 is a lack of attention, momentary or habitual.
• Related軽率けいそつNeutralActing without proper thought, as in 「軽率な発言」; 「不注意」 stresses a lack of attention rather than hasty judgment.
• Related無謀むぼうNeutralRecklessly ignoring the risks, as in 「無謀な計画」; 「不注意」 carries no nuance of taking chances.
• Related向こう見ずむこうみずNeutralActs with no thought of the consequences; stresses recklessness, while 「不注意」 is a lapse in attention or negligence.
• Related無鉄砲むてっぽうCasualColloquial: charging ahead regardless of everything; 「不注意」 is simply carelessness or inattention.
• Related卒爾そつじWrittenLiterary: hasty or abrupt, and by extension rash and ill-considered, as in 「卒爾ながら」.
• Related無考えむかんがえNeutralUnthinking — acting without using one's head; 「不注意」 stresses failing to keep one's mind on something.
• RelatedうかつNeutralA momentary lapse or oversight, often as 「迂闊だった」 with a tone of self-reproach; very close to 「不注意」.
• Related粗忽そこつWrittenWritten/formal prose: blundering carelessness that causes mistakes; used only rarely.
• Antonym注意深いちゅういぶかいNeutralAttentive and careful in everything one does; the direct opposite of 「不注意」.
• Antonym用心深いようじんぶかいNeutralEver vigilant and on one's guard; the direct opposite of 「不注意」.

For a lapse in attention, 「不注意」 is the default; 「迂闊」 suits a momentary slip admitted with self-reproach. For a scatterbrained temperament say 「そそっかしい」; for acting without weighing consequences, 「軽率」 or 「無謀」. 「向こう見ず」 and colloquial 「無鉄砲」 stress recklessness, 「無考え」 unthinking acts, and literary 「卒爾」 and 「粗忽」 hasty blunders. Antonyms: 「注意深い」, 「用心深い」.

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

1. 注意ちゅういが足たりないこと。注意ちゅういを怠おこたること。
2. 注意ちゅういが足たりないさま。