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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
Unsuitable or inappropriate or a given purpose or situation
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“During the festive season, injuries result from improper use of fireworks.”
Adjective
Not acceptable by, or not in accordance with, accepted standards or rules
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“But I am criticizing Mr. Beck, because I think it was a highly improper use of union funds in this way, for his own direct financial benefit.”
Adjective
Lacking in modesty or decency by normal social standards
“That sort of behavior was highly improper for a lady of good breeding and even bluer bloodlines.”
Adjective
Lacking in sophistication, refinement or grace
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“Her traitorous belly rumbled noisily, making uncouth and improper sounds in the silent room.”
Adjective
Vulgar or obscene in nature
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“Lord Rockwell hopes a few nights at the Chateau Debauchery will sate his inconvenient desire for the woman he propositioned a year ago, or will his improper proposition make things worse?”
Adjective
Brazen or forward in one's behavior or approach
“Was it possible that she had actually suggested something so very brazen and improper even as a joke?”
Adjective
Illegal or unlawful in nature
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“The company could also claim that any investigation was tainted by the improper theft of its documents.”
Adjective
Dishonest or immoral in one's character or conduct
“They had a duty to know what Synanon was doing and to ensure that this type of systematic criminal and improper conduct did not occur.”
Adjective
Depraved, perverted or extremely wrong in a moral sense
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“In the same manner, if one's mind is perverted and improper, his heart becomes unreasonable.”
Adjective
Characterized by, or suggestive of, adultery
“Had Alex been having an improper affair with one of the staff and was now leaving to avoid being busted?”
Adjective
Not honorable in character or purpose
Adjective
(of a falsehood) Concocted to deceive others
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Adjective
Showing no shame or embarrassment
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Adjective
Not legally valid or binding
Adjective
(archaic) Overfamiliar or forward
Adjective
Not admissible, especially as evidence or as an argument
Adjective
Lacking piety or respect for the sacred
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
(informal, of a person) Having an unreasonable disposition or character
Adjective
Very severe or serious
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