unacceptable (adj.)

• bad
• disagreeable
• distasteful
• exceptionable
• ill-favored
• impossible
• improper
• inadmissible
• inappropriate
• indefensible
• intolerable
• objectionable
• tasteless
• unasked
• undesirable
• uninvited
• unpleasant
• unsatisfactory
• unsuitable
• untenable
• unwanted
• unwelcome
• wrong