What is the opposite of proper?

Need antonyms for proper? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of suited or acceptable to the purpose or circumstances
Improper use of gym equipment can result in injury.”
Adjective
Opposite of accurate in conformity to acceptable standards
“I know you think you can do backflips, but the technique is wrong, and you can end up breaking your neck.”
Adjective
Opposite of following the established standards of behavior or manners
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“His party habits were unbecoming of a member of the aristocracy.”
Adjective
Opposite of strictly conventional in one's manner or behavior
“Jerry had an unceremonious retirement, but he was characteristically unceremonious himself.”
Adjective
Opposite of real or genuine
“His attempts at displaying sympathy would, unfortunately, come across as rather superficial.”
Adjective
Opposite of characteristic of a particular person or thing
“That is an atypical location to find this breed of snake, as it usually thrives in warmer conditions.”
Adjective
Opposite of belonging or relating exclusively or distinctively to
“This principle is general to human behavior, though there will always be exceptions.”
Adjective
(colloquial) Opposite of used as an intensifier, especially in derogatory contexts
“Admittedly, I was a partial supporter of his philosophies, up until the point where he was exposed as a fraud.”
Adjective
Opposite of of high quality
“In my years of watching this sport, I have never seen anything more terrible in a game of tennis.”
Adjective
Opposite of refined, polite, and well-mannered in one's nature or dealings with others
Adjective
Opposite of having, or conforming to, high moral standards or principles
“We ask you not to allow the despicable act of one person to stain the reputation of an entire community of good, hard-working people.”
Adjective
Opposite of conforming or adhering to whatever is customary, traditional, or generally accepted
Adjective
Opposite of characterized by being fair, just, or impartial
Adjective
Opposite of having a valid reason
Adjective
Opposite of suitable for some particular purpose
Adjective
Opposite of being consistent, compatible, or in agreement with something else or a whole
Adjective
Opposite of worthy of being recommended
Adjective
Opposite of acceptable or appropriate
Adjective
Opposite of of a suitable quality, standard, or type to meet the required purpose
“Nitrate moving downward may pollute groundwater and well water, thus making it unsuitable for human use.”
Adjective
Opposite of shy, extremely humble and modest
Adjective
Opposite of calm, dignified, and unhurried
Adjective
(generic intensifier) Opposite of extreme or absolute in degree
“I am intrigued by your mitigated sense of self-righteousness, but not entirely surprised.”
Adjective
(of a person) Opposite of strictly conventional in one's manner or behavior
“She was elegant and bookish, while he was casual and endearingly laid-back.”
Adjective
Opposite of suited or acceptable to the purpose or circumstances
“Given the circumstances surrounding the tragedy, it was a particularly imprudent thing to say.”
Adjective
Opposite of obeying the laws of society
Adjective
Opposite of clean and tidy in appearance or character
“He arrives at our untidy, chaotic office and literally turns his nose up in distaste at the mess.”
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