Source : Webster's Revised Unabridged Dictionary (1913)

Innocuous \In*noc"u*ous\, a. [L. innocuus; in- not + nocuus
   hurtful, fr. nocere to hurt. See {Innocent}.]
   Harmless; producing no ill effect; innocent.

         A patient, innocuous, innocent man.      --Burton.
   -- {In*noc"u*ous*ly}, adv. -- {In*noc"u*ous*ness}, n.

         Where the salt sea innocuously breaks.   --Wordsworth.

Source : WordNet®

innocuous
     adj 1: not injurious to physical or mental health [syn: {harmless}]
            [ant: {noxious}]
     2: unlikely to harm or disturb anyone; "harmless old man" [syn:
         {harmless}]
     3: not causing disapproval; "it was an innocuous remark";
        "confined himself to innocuous generalities";
        "unobjectionable behavior" [syn: {unobjectionable}]
     4: lacking intent or capacity to injure; "an innocent prank"
        [syn: {innocent}]