Open English Wordnet
Adjectives
(a)indecorous, indelicatelacking propriety and good taste in manners and conduct“indecorous behavior”
(s)indecent, indecorous, unbecoming, uncomely, unseemly, untowardnot in keeping with accepted standards of what is right or proper in polite society“was buried with indecent haste”, “indecorous behavior”, “language unbecoming to a lady”, “unseemly to use profanity”, “moved to curb their untoward ribaldry”