What is another word for improper?

Need synonyms for improper? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not in accordance with accepted standards, especially of morality or honesty
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“During the festive season, injuries result from improper use of fireworks.”
Adjective
Lacking in modesty or decency
“He touched himself in public without thought as to how improper it may be to others.”
Adjective
Vulgar or indecent in nature or quality
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Adjective
Having or showing no moral principles
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Adjective
Not honorable in character or purpose
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Adjective
(of a falsehood) Concocted to deceive others
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Adjective
Not up to the required standard or quality
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Adjective
Not legally valid or binding
Adjective
(archaic) Overfamiliar or forward
Adjective
Relating to crime
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Adjective
Not admissible, especially as evidence or as an argument
Adjective
In violation of one or more of the rules and conventions of a language as defined by the grammar, resulting in unacceptable, or incorrect, usage
Adjective
Contrary to what is usual, traditional, or accepted
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Adjective
Of, or characterized by, adultery
Adjective
(informal, of a person) Having an unreasonable disposition or character
Adjective
Very severe or serious
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