Wordnet 3.0
ADJECTIVE (1)
1. 
 violating accepted standards or rules; 
- Example: "a dirty fighter"- Example: "used foul means to gain power"- Example: "a nasty unsporting serve"- Example: "fined for unsportsmanlike behavior"[syn: cheating(a), dirty, foul, unsporting, unsportsmanlike]
WordNet (r) 3.0 (2006):
unsporting
    adj 1: violating accepted standards or rules; "a dirty fighter";
           "used foul means to gain power"; "a nasty unsporting
           serve"; "fined for unsportsmanlike behavior" [syn:
           cheating(a), dirty, foul, unsporting,
           unsportsmanlike]