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)
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