なくす・無くす・失くすnakusu[0]heiban (flat)

1. godan verb, transitive verbto lose (something)
   彼女かのじょは新あたらしい時計とけいをなくした。↗

   She lost her new watch.
2. godan verb, transitive verbto get rid of; to eliminate; to remove; to eradicate; to abolish
   その国くにの財政ざいせいの赤字あかじをなくすには、もっと、たくさんの外国がいこくの援助えんじょを注ぎ込そそぎこまなければならなかった。↗

   To get the nation's economy out of the red, more foreign aid had to be pumped in.

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

• Synonym失ううしなうNeutralFor losing abstract things or loved ones, as in 「自信を失う」; leans more toward written prose than 「なくす」.
• Synonym紛失ふんしつWrittenWritten word for things going missing, common in loss reports and official documents, as in 「紛失届」.
• Synonym遺失いしつWrittenLegal term for losing money or valuables, as in 「遺失物」; common in lost-and-found contexts.
• Synonym喪失そうしつWrittenLoss of abstract things such as abilities or rights, as in 「記憶喪失」「自信喪失」.
• Synonym失するしっするWrittenWritten word for missing an opportunity or failing in courtesy, as in 「時機を失する」「礼を失する」.
• Synonym落とすおとすNeutralFor things falling or items like a wallet being lost; the emphasis is on the falling.
• Synonym亡失ぼうしつWrittenWritten word for losing something, mostly in official documents; not used in everyday speech.
• Related置き忘れるおきわすれるNeutralFor putting something down somewhere and forgetting to take it, as in 「傘を置き忘れる」.
• Related見失うみうしなうNeutralFor losing sight of a person or thing you had been watching; also figuratively, for losing your way.
• Related忘れるわすれるNeutralFor forgetting, including forgetting to bring something; centred on memory rather than loss.
• Related取り落とすとりおとすNeutralFor dropping something you were holding because you failed to keep hold of it, or for missing a chance.
• Related忘失ぼうしつWrittenWritten word for forgetting and losing; very rarely used.
• Related落っことすおっことすCasualColloquial word for accidentally dropping something.
• Related無くなすなくなすNeutralMeans the same as 「なくす」 but is rarely used; say 「なくす」 instead.
• Related置き違えるおきちがえるNeutralFor putting something in the wrong place; the point is the mistaken location.
• Antonym見つけるみつけるNeutralAntonym of 「なくす」: to find or discover something.
• Antonym拾うひろうNeutralAntonym of 「なくす」: to pick up something that has been dropped.
• Antonym得るうるWrittenAntonym of 「なくす」: to get or obtain; leans toward written use.

Default to 「なくす」 for losing something. For written or abstract loss use 「失う」 or 「喪失」; for reporting lost items 「紛失」; for leaving something behind 「置き忘れる」; for dropping something 「落とす」; for finding it again 「見つける」. 「遺失」「亡失」「忘失」「失する」 are formal or rare, 「落っことす」 is colloquial, and 「取り落とす」「見失う」「忘れる」「置き違える」「無くなす」 cover narrower senses.

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

1. （無なくす・失なくす）今いままで持もっていたものを失うしなう。
2. （無なくす）努つとめて、ない状態じょうたいにする