Jisho

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よくない could be an inflection of よい, with these forms:
  • Nai-form. It indicates the negative form of the verb.

Searched for よくない. You can also try a search for "yokunai".

Words — 1 found

1. (that's) no good, is it?Usually written using kana alone
Noun
2. dislike (on social media, etc.); thumbs-down; downvoteUsually written using kana alone, Antonym: いいね
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