Being acceptable can have a wide range of antonyms dependant on the context, including unacceptable, unsatisfactory, inappropriate, unappealing, unapproved, disapproved, objectionable, and unlikable. An unacceptable behavior may derive from a lack of morals or ethics, poor taste, or even illegality. Unsatisfactory means something that does not meet the expected standards or requirements, while inappropriate refers to something that is not fitting or suitable for a particular context. Unappealing may suggest something that is not attractive or appealing to the senses, while disapproved indicates that an action is rejected or condemned by someone in authority. Objectionable suggests that something is unpleasant or offensive, and unlikable may indicate that something or someone is difficult to appreciate or associate with.