How to say "dishonest" in Japanese

Choosing the right word
  • ずるいJLPT N2approx.Common
    i-adjectiveCovers 'dishonest' as sly and sneaky: a person who tricks, cheats, or bends the rules for personal gain. Typical of complaints about a classmate who copies answers or a colleague who takes credit.
    狐きつねは他たのどんな動物どうぶつよりもずるいということだ。↗
    It is said that the fox is more cunning than any other animal.
  • 不純ふじゅんCommon
    na-adjective, nounSeldom the word you want for 'dishonest': it really means impure or adulterated, and suits only the sense of dishonest motives — intentions that are impure — rather than dishonest people or deeds.
    不純ふじゅんな飲料水いんりょうすいは病気びょうきの媒体ばいたいとなりうる。↗
    Impure drinking water can be a carrier of diseases.

Use 「ずるい」 for dishonesty as sneaky, crafty behavior — someone who tricks or cheats to gain an advantage; 不純 is not a general word for dishonest, fitting only the sense of impure motives.

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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