成(な)り済(す)まし

なりすまし
noun
impersonation; identity fraud; spoofing
technology
1. impersonation; identity fraud; spoofing
The act of pretending to be someone else, especially to deceive others. Widely used in contexts of online fraud, phishing, fake accounts, and identity theft.
成(な)り済(す)ましメールに注意(ちゅうい)してください。
Please be careful of spoofing emails.
SNSで有名人(ゆうめいじん)の成(な)り済(す)ましアカウントが増(ふ)えている。
Fake accounts impersonating celebrities are increasing on social media.
成(な)り済(す)ましによる詐欺(さぎ)被害(ひがい)が年々(ねんねん)増加(ぞうか)している。
Fraud damage from impersonation is increasing year by year.
銀行(ぎんこう)を装(よそお)った成(な)り済(す)ましサイトに個人情報(こじんじょうほう)を入力(にゅうりょく)しないでください。
Do not enter personal information on sites impersonating banks.

Originally from the verb 成り済ます (to pretend to be), this noun form has become extremely common in modern Japanese due to the rise of internet fraud and identity theft. One of the key vocabulary items for digital literacy in Japan.

Common collocations

Similar words

  • 偽装(ぎそう): disguise, camouflage — broader; hiding true identity or nature
  • 詐称(さしょう): false claim — claiming a title or qualification one doesn't have
  • フィッシング: phishing — specifically the act of using fake communications to steal information

Related Words

Compare: 偽装(ぎそう) (disguise, camouflage)
general
Added 2026.5.5 23:15 · Revised 2026.9.4 21:31
26500/26867_narisumashi