Wordnet 3.0
ADJECTIVE (1)
1. 
 pertaining to or causing degeneration in the offspring produced; 
[syn: dysgenic, cacogenic]
WordNet (r) 3.0 (2006):
cacogenic
    adj 1: pertaining to or causing degeneration in the offspring
           produced [syn: dysgenic, cacogenic] [ant: eugenic]