Wordnet 3.0
ADJECTIVE (1)
1. 
 devoid of ferns; 
The Collaborative International Dictionary of English v.0.48:
fernless \fernless\ adj.
   devoid of ferns. Opposite of ferned.
   [WordNet 1.5]
WordNet (r) 3.0 (2006):
fernless
    adj 1: devoid of ferns [ant: ferned, ferny]