hatless

from WordNet (r) 3.0 (2006)
hatless
    adj 1: not wearing a hat; "stood hatless in the rain with water
           dripping down his neck" [ant: {hatted}]
    
from The Collaborative International Dictionary of English v.0.48
Hatless \Hat"less\ (h[a^]t"l[e^]s), a.
   Having no hat.
   [1913 Webster]
    

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