If you describe an action as criminal, you think it is very wrong or a serious mistake. Someone who commits a crime: If you're a murderer, thief, or tax cheat, you're a criminal.
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How to use criminal in a sentence. A criminal is someone who breaks the law. Criminal synonyms, criminal pronunciation, criminal translation, english dictionary definition of criminal.
The meaning of criminal is relating to, involving, or being a crime.
Very bad or morally wrong:
