Source : Webster's Revised Unabridged Dictionary (1913)

Indelicate \In*del"i*cate\, a. [Pref. in- not + delicate: cf. F.
   ind['e]licat.]
   Not delicate; wanting delicacy; offensive to good manners, or
   to purity of mind; coarse; rude; as, an indelicate word or
   suggestion; indelicate behavior. --Macaulay. --
   {In*del"i*cate*ly}, adv.

   Syn: Indecorous; unbecoming; unseemly; rude; coarse; broad;
        impolite; gross; indecent; offensive; improper;
        unchaste; impure; unrefined.

Source : WordNet®

indelicate
     adj 1: in violation of good taste even verging on the indecent; "an
            indelicate remark"; "an off-color joke" [syn: {off-color},
             {off-colour}]
     2: lacking propriety and good taste in manners and conduct;
        "indecorous behavior" [syn: {indecorous}] [ant: {decorous}]
     3: verging on the indecent; "an indelicate proposition"