失う・喪う|うしなうushinau[0]heiban (flat)

1. godan verb, transitive verbto lose
   ミスで財産ざいさんを失うしなった。↗

   My mistake cost me my fortune.
2. godan verb, transitive verbto miss (a chance, opportunity)
3. godan verb, transitive verbto lose (a loved one); to be bereaved of
4. godan verb, transitive verbto concede (goals, points, etc.)

• Synonym落とすおとすNeutralRefers to dropping something or losing it, as in 「財布を落とす」; the focus is on the act of dropping. 「失う」 also covers abstract things like confidence or opportunities.
• SynonymなくすNeutralCommon in everyday speech for losing an object, as in 「鍵を無くす」. 「失う」 is more written and mostly used for things like trust or life.
• Synonym逸するいっするWrittenWritten language. Means missing a chance, as in 「好機を逸する」, and also deviating, as in 「常軌を逸する」.
• Synonym失するしっするWrittenWritten language for losing propriety or timing, as in 「礼を失する」 and 「時機を失する」; it can also mean going to excess.
• Synonym喪失そうしつWrittenA noun for the loss of abilities, qualifications and the like, as in 「記憶喪失」 or 「自信喪失」; written and abstract in flavour.
• Synonym紛失ふんしつFormalFormal. Used when an item goes missing, as in 「書類を紛失する」; applies to objects only.
• Synonym遺失いしつWrittenA legal term for losing valuables or property, as in 「遺失物」; in daily speech one says 「落とし物」.
• Synonym亡くすなくすNeutralSpecifically losing someone through their death, as in 「父を亡くす」 or 「愛犬を亡くす」 — family, friends or pets. 「失う」 covers this too but has a wider range.
• Synonym逃すのがすNeutralFor missing a chance or letting prey get away, as in 「チャンスを逃す」; the focus is on failing to catch or seize.
• Synonym亡失ぼうしつWrittenWritten word for losing something; rare in modern usage — say 「紛失」 or 「失う」 instead.
• Synonym落っことすおっことすCasualColloquial, a casual form of 「落とす」 for carelessly dropping something; 「失う」 lacks this offhand feel.
• Synonym損亡そんもうWrittenWritten word for financial or material loss; rare today — in everyday use say 「損失」 or 「失う」.
• Synonym無くなすなくなすCasualA dialectal or colloquial variant of 「無くす」 with the same meaning; in daily life people usually say 「なくす」.
• Synonym死に別れるしにわかれるNeutralIntransitive; describes being parted from someone by death, as in 「妻と死に別れる」, stressing the separation. 「失う」 is transitive.
• Related置き忘れるおきわすれるNeutralFor leaving something somewhere and forgetting to take it, as in 「傘を置き忘れる」; the stress is on forgetting.
• Related取り落とすとりおとすNeutralFor dropping something you were holding or letting it slip through; the emphasis is on a fumble of the hands, which 「失う」 does not stress.
• Antonym得るうるWrittenAntonym. Means to get or obtain, as in 「信頼を得る」, and leans written/formal.
• Antonym手に入れるてにいれるNeutralAntonym. Means to get one's hands on something, as in 「チケットを手に入れる」; common in speech.

Use 「失う」 for losing what you had — trust, life, opportunities. To lose an object, everyday speech says 「無くす」 or 「落とす」, formal contexts 「紛失」. For losing someone to death use 「亡くす」; for missing a chance, 「逃す」. The rest are narrower: 「置き忘れる」 for leaving things behind, 「取り落とす」 for dropping what you hold, 「逸する」 and 「失する」 as written words for missed chances, and 「喪失」 as a written noun for loss of ability or confidence.

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

1. 持もっていたものを無なくす。
2. 手てに入いれようとしたものを取り逃とりにがす。
3. 大切たいせつな人ひとを亡なくす。
4. 競技きょうぎやゲームで相手あいてに得点とくてんを入いれられる。