The Collaborative International Dictionary of English v.0.48:
nongregarious \nongregarious\ adj. Not growing or living in groups or colonies; -- of plants and animals. Syn: nonsocial, solitary. [WordNet 1.5]WordNet (r) 3.0 (2006):
nongregarious adj 1: of plants and animals; not growing or living in groups or colonies; "solitary bees" [syn: nongregarious, nonsocial, solitary]