Source : Webster's Revised Unabridged Dictionary (1913)

Indecent \In*de"cent\, a. [L. indecens unseemly, unbecoming: cf.
   F. ind['e]cent. See {In-} not, and {Decent}.]
   Not decent; unfit to be seen or heard; offensive to modesty
   and delicacy; as, indecent language. --Cowper.

   Syn: Unbecoming; indecorous; indelicate; unseemly; immodest;
        gross; shameful; impure; improper; obscene; filthy.

Source : WordNet®

indecent
     adj 1: 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" [syn: {indecorous}, {unbecoming},
             {uncomely}, {unseemly}, {untoward}]
     2: offensive to good taste especially in sexual matters; "an
        earthy but not indecent story"; "an indecent gesture"
        [ant: {decent}]
     3: offending against sexual mores in conduct or appearance; "a
        bathing suit considered indecent by local standards"