Synonyms of 'unacceptable'
not allowable or acceptable
Evidence presented by the prosecution was judged inadmissible.
not suitable or proper
That remark was inappropriate for such a serious issue.
offensive or unacceptable
an objectionable, stuck-up young woman
The people at my table were so obnoxious, I had to leave.
dislikable or dislikeable
yucky or yukky (slang)
yucko (Australian, slang)
off (British, informal)
not up to the usual standard
Playing your music that loud – it's a bit off, isn't it?
unpleasant or disgusting to the senses
the offensive smell of manure
out of order (informal)
not following the rules or customary procedure
Don't you think that remark was a bit out of order?
very bad, unpleasant, or unsatisfactory
I have the most terrible nightmares.
not desirable or pleasant
A large group of undesirable strangers crashed her party.
Video: pronunciation of 'unacceptable'
Thesaurus for unacceptable from the Collins English Thesaurus