手落ち|ておちteochi[3]odaka (tail-high)

1. nounoversight; omission
   検査けんさに手落ておちがあったのではないだろうか。↗

   I suspect that there was an oversight in the examination.

• Synonym過失かしつNeutralFaults arising from carelessness, mostly in legal or accident contexts, as in 「過失致死」.
• Synonym落ち度おちどNeutralA blameworthy error; interchangeable with 「手落ち」, often phrased 「こちらの落ち度」.
• Synonym不行き届きふゆきとどきNeutralInsufficient care or supervision; frequently used in apologies, as in 「不行き届きをお詫びします」.
• Synonym見落しみおとしNeutralFailing to notice a problem or fact — the stress is on overlooking; 「手落ち」 stresses not doing something thoroughly.
• Synonym怠りおこたりWrittenSlackness or negligence, mostly in the negative 「怠りなく」; on its own it has a written, formal feel.
• Synonym手抜かりてぬかりNeutralNearly interchangeable with 「手落ち」 for oversights caused by carelessness; slightly more conversational in tone.
• Synonym抜かりぬかりNeutralMostly used in the negative, as in 「抜かりはない」, for lapses in preparation; rarely used on its own.
• SynonymそつNeutralUsually in 「そつがない」, praising smooth, flawless handling; alone it means a slip-up, and can also mean waste.
• Related抜け目ぬけめNeutralMostly in 「抜け目がない」, describing a shrewd person who never loses out; its oversight sense is used quite differently.
• RelatedなおざりWrittenA written word for treating something lightly, usually as 「等閑にする」; an attitude of neglect rather than a concrete oversight.
• Related手抜きてぬきNeutralDeliberately skipping effort that should be put in — cutting corners; intentional, whereas 「手落ち」 is usually unintentional.
• Related怠慢たいまんWrittenA written word for neglect of duty, stressing a lazy attitude; mostly for failures in one's official or professional role.
• Related為落とししおとしWrittenA written word for failing to do what should be done, especially leaving out required entries in documents; close to 「手落ち」 but rare in daily use.
• Related為落ちしおちWrittenA written word for forgetting to do what one should; close to 「手落ち」 but very rare — in daily speech say 「手落ち」 or 「手抜かり」.
• Related疎漏そろうWrittenA stiff written Sino-Japanese word for lapses from work done too roughly and carelessly; in everyday speech say 「手落ち」.
• Related漏れもれNeutralCovers leaks of liquids and gases as well as omissions; for oversights it appears mostly in compounds like 「記入漏れ」「連絡漏れ」.
• Related疎慢そまんWrittenA written word describing slipshod, sloppy work, stressing a careless attitude, while 「手落ち」 refers to a concrete oversight.
• Related目溢れめこぼれNeutralMissing something through inattention, or the thing missed; stresses not seeing, while 「手落ち」 covers oversights generally.
• RelatedないがしろNeutralMaking light of a person or thing, as in 「親を蔑ろにする」; an attitude, whereas 「手落ち」 is a concrete lapse in one's work.
• Related閑却かんきゃくWrittenA written Sino-Japanese word for leaving something unattended; stresses disregard as an attitude.
• Antonym手ぬかりないNeutralAntonym: thoroughly prepared, with no lapses at all; the opposite of 「手落ち」, often phrased 「手抜かりなく」.

For oversights and blunders, 「手落ち」 and 「落ち度」 are the everyday choices. Use 「見落とし」 for failing to notice something, 「不行き届き」 when apologizing for lapses in care, and 「手抜き」 for deliberate corner-cutting. 「手抜かり」 is a near-equal alternative; 「抜かり」「そつ」「抜け目」 appear mostly in set phrases; 「過失」 fits legal and accident contexts; the Sino-Japanese words 疎漏・疎慢・怠慢・等閑・閑却 and the rarer 為落とし・為落ち・怠り belong to written or formal prose; 「手ぬかりない」 is the antonym: fully prepared, with no lapses.

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

1. 落ち度おちど。不始末ふしまつ。手抜てぬかり。