Not decent; unfit to be seen or heard; offensive to modesty and delicacy; as, indecent language.

offensive to good taste especially in sexual matters; "an earthy but not indecent story"; "an indecent gesture"

offending against sexual mores in conduct or appearance; "a bathing suit considered indecent by local standards"

not 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"

Often refers to exposing one's genital parts in public