From Collins Dictionary
Something that is inappropriate is not useful or suitable for a particular situation or purpose.
The industry is inappropriate to the region’s present and future needs.
There is no suggestion that clients have been sold inappropriate policies.
inappropriately adverb [ADVERB with verb]
He was dressed inappropriately for the heat in a dark suit.
If you say that someone’s speech or behaviour in a particular situation is inappropriate, you are criticizing it because you think it is not suitable for that situation.
I feel the remark was inappropriate for such a serious issue.
It is inappropriate for a judge to belong to a discriminatory club.
Synonyms: improper, unsuitable, out of place, unacceptable
inappropriately adverb [ADVERB with verb, ADVERB adjective]
You have the law on your side if the bank is acting inappropriately.
…behavior that may appear inappropriately childish.
Definition of inappropriate
: not appropriate: unsuitable inappropriate behavior.
The movie’s subject matter is inappropriate for small children.
Other Words from inappropriate
the inappropriateness of his comments
Synonyms & Antonyms for inappropriate
Synonyms: amiss, graceless, improper, inapposite, inapt, incongruous, incorrect, indecorous, inept, infelicitous, malapropos, perverse, unapt, unbecoming, unfit, unhappy, unseemly, unsuitable, untoward, wrong
Antonyms: appropriate, becoming, befitting, correct, decorous, felicitous, fit, fitting, genteel, happy, meet, proper, right, seemly, suitable
From the Urban Dictionary
The word people use when you’ve done something that isn’t technically “bad” or “wrong” but they still don’t like it anyway and expect you to conform to their personal tastes.
Burping after a meal is inappropriate; there’s no rule against it, but people don’t like it so you have to conform.
The current euphemism for “wrong” or “bad.” It is supposed to sound more objective than “wrong” and “bad,” but it is not.
I’m not saying that you shouldn’t have called him an asshole, because he is; it was just inappropriate.
Wearing nothing but lingerie to the office is not wrong; it’s just inappropriate.
In high school settings, short skirts, low cut tops, see through clothing and skin tight jeans. The student handbook says not to wear this, but many girls still wear it anyway to look skanky.
Principal: Young lady, that top is inappropriate!
*someone throws bottle and hits him in the head*