Synonyms of improper
1 inappropriateDictionary • He maintained that he had done nothing improper.
inappropriate • That remark was inappropriate for such a serious issue.
unfit • I can show them plenty of houses unfit for human habitation.
unsuitable • Amy's shoes were unsuitable for walking any distance.
out of place • One word out of place may kill the whole peace process.
incongruous • She looked incongruous in an army uniform.
ill-timed • He argued that the tax cut was ill-timed.
uncalled-for • Leo's uncalled-for remarks about her cousin
inopportune • The dismissals came at an inopportune time.
inapplicable • His theory was inapplicable to many less developed economies.
2 indecentDictionary • He would never be improper; he is always the perfect gentleman.
indecent • The legislation was drafted with indecent haste.
vulgar • an oaf with a taste for racist and vulgar jokes
suggestive • A female employee claimed he made suggestive remarks to her.
unseemly • It would be unseemly for judges to receive pay increases.
risqué • a cheeky comment or a risqué suggestion
smutty • She said she detested smutty jokes.
unbecoming • Those involved had performed acts unbecoming of university students.
impolite • It would be most impolite to refuse a simple invitation to supper.
off-colour • his off-colour jokes about women
indelicate • She could not touch upon such an indelicate subject.
3 incorrectDictionary • The improper use of medicine can lead to severe adverse reactions.
incorrect • He denied that his evidence was incorrect.
wrong • That was the wrong answer - try again.
inaccurate • The reports were based on inaccurate information.
false • This resulted in false information being entered.
irregular • The minister was accused of irregular business practices.
erroneous • The conclusions they have come to are completely erroneous.
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erroneousBeliefs, opinions, or methods that are erroneous are incorrect or only partly correct.
• The conclusions they have come to are completely erroneous.
wide of the mark,
wide of the mark,
• This resulted in false information being entered.
ill-timedIf you describe something as ill-timed, you mean that it happens or is done at the wrong time, so that it is damaging or rude.
• He argued that the tax cut was ill-timed.
Thesaurus for improper from the Collins English Thesaurus
lacking propriety; not seemly or fitting