scentless

from WordNet (r) 3.0 (2006)

scentless
    adj 1: lacking the sense of smell [ant: {scented}]
    2: emitting or holding no odor; "scentless wisps of straw"; "a
       scentless stretch of rocky ground"

from The Collaborative International Dictionary of English v.0.48

Scentless \Scent"less\, a.
   Having no scent.
   [1913 Webster]

         The scentless and the scented rose.      --Cowper.
   [1913 Webster]

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