inodorous

from WordNet (r) 3.0 (2006)

inodorous
    adj 1: having no odor; "odorless gas"; "odorless flowers" [syn:
           {odorless}, {odourless}, {inodorous}] [ant: {odorous}]

from The Collaborative International Dictionary of English v.0.48

Inodorous \In*o"dor*ous\, a. [L. inodorus. See {In-} not, and
   {Odorous}.]
   Emitting no odor; without smell; scentless; odorless. --
   {In*o"dor*ous*ness}, n.
   [1913 Webster]