Wordnet 3.0
ADJECTIVE (1)
1. 
 like or suggestive of a sheep in docility or stupidity or meekness or timidity; 
[syn: sheeplike, sheepish]
WordNet (r) 3.0 (2006):
sheeplike
    adj 1: like or suggestive of a sheep in docility or stupidity or
           meekness or timidity [syn: sheeplike, sheepish]