improper -
not suitable or right or appropriate; "slightly improper to dine alone with a married man"; "improper medication"; "improper attire for the golf course"
proper appropriate for a condition or purpose or occasion or a person's character, needs; "everything in its proper place"; "the right man for the job"; "she is not suitable for the position"
inappropriate not suitable for a particular occasion etc; "noise seems inappropriate at a time of sadness"; "inappropriate shoes for a walk on the beach"; "put inappropriate pressure on them"
indecent offensive to good taste especially in sexual matters; "an earthy but not indecent story"; "an indecent gesture"
indecorous,
indelicate lacking propriety and good taste in manners and conduct; "indecorous behavior"
unfit not in good physical or mental condition; out of condition; "fat and very unfit"; "certified as unfit for army service"; "drunk and unfit for service"
wrong based on or acting or judging in error; "it is wrong to think that way"
inappropriate not suitable for a particular occasion etc; "noise seems inappropriate at a time of sadness"; "inappropriate shoes for a walk on the beach"; "put inappropriate pressure on them"