1) Disappointing 2) Illogical 3) Inadequate 4) Insufficient 5) Not acceptable 6) Not good enough 7) Not permissible 8) Not satisfactory or allowable 9) Not up to scratch 10) Not welcome 11) Null 12) Poor 13) Substandard 14) Unfounded 15) Unsatisfactory 16) Unsound 17) Untrue 18) Void 19) Worthless Found on https://www.crosswordclues.com/clue/unacceptable
unacceptedadjective not conforming to standard usage; `the following use of `access` was judged unacceptable by a panel of linguists; `You can access your cash at any of 300 automatic tellers`` Found on https://www.encyclo.co.uk/local/20974