The Collaborative International Dictionary of English v.0.48:

Innocuous \In*noc"u*ous\, a. [L. innocuus; in- not + nocuus
   hurtful, fr. nocere to hurt. See Innocent.]
   Harmless; producing no ill effect.
   [1913 Webster]

         A patient, innocuous, innocent man.      --Burton.
   -- In*noc"u*ous*ly, adv. -- In*noc"u*ous*ness, n.
   [1913 Webster]

         Where the salt sea innocuously breaks.   --Wordsworth.
   [1913 Webster]