How to say "counterfeit" in Japanese

Choosing the right word
  • 偽物にせものJLPT N1approx.Common
    nounThe everyday noun for a counterfeit article — a watch or designer bag that is not genuine. For 'counterfeit' as a noun meaning a fake thing, this is usually the word you want.
    この本物ほんものの宝石ほうせきとその偽物にせものとを比較ひかくしてみなさい。↗
    Compare this genuine jewel with that imitation.
  • 似せるにせるCommon
    ichidan verb, transitive verbA verb: to make one thing resemble another, to imitate. When you need 'counterfeit' as a verb, this is the match, though its basic meaning is simply copying or imitating, not necessarily fraud.
  • 模造もぞうCommon
    suru verb, transitive verb, no-adjectiveA noun for an imitation — something made in resemblance of a genuine article. It leans toward the 'imitation' side of 'counterfeit', suiting manufactured imitations more than talk of fraud or forgery.
  • 贋作がんさくCommon
    noun, suru verb, transitive verbA counterfeit in the sense of a fake work: a forged painting, book, or similar creation passed off as genuine. For counterfeit goods or money, this is not the usual word.
  • 偽にせCommon
    no-adjectiveThe compact form for 'fake' or 'phony', working much like a prefix that marks something as counterfeit; 偽物 is the full noun for a fake article, 偽 the shorter element.
    それは贋にせの真珠しんじゅにすぎない。↗
    It is merely an imitation pearl.

Use 偽物 for a counterfeit article and 偽 as its compact prefix-like form, 「似せる」 when you need the verb 'to counterfeit', 模造 for manufactured imitations, and 贋作 for forged works such as paintings.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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