Search Result for "pessimum": 
Wordnet 3.0

ADJECTIVE (1)

1. of an organism's environment; least favorable for survival;
[syn: pessimal, pessimum(a)]



WordNet (r) 3.0 (2006):

pessimum
    adj 1: of an organism's environment; least favorable for
           survival [syn: pessimal, pessimum(a)]