Wordnet 3.0
ADJECTIVE (1)
1. 
 having no hair or fur; 
- Example: "a Mexican Hairless is about the size of a fox terrier and hairless except for a tufts on the head and tail"
The Collaborative International Dictionary of English v.0.48:
Hairless \Hair"less\, a.
   Destitute of hair; bald. --Shak.
   [1913 Webster]
WordNet (r) 3.0 (2006):
hairless
    adj 1: having no hair or fur; "a Mexican Hairless is about the
           size of a fox terrier and hairless except for a tufts on
           the head and tail" [ant: haired, hairy, hirsute]