Wordnet 3.0
ADJECTIVE (2)
1. 
 not offending; 
- Example: "an unoffending motorist should not have been stopped"2. 
 not causing anger or annoyance; 
- Example: "inoffensive behavior"[syn: inoffensive, unoffending]
The Collaborative International Dictionary of English v.0.48:
Unoffending \Unoffending\
   See offending.
WordNet (r) 3.0 (2006):
unoffending
    adj 1: not offending; "an unoffending motorist should not have
           been stopped" [ant: offending]
    2: not causing anger or annoyance; "inoffensive behavior" [syn:
       inoffensive, unoffending] [ant: offensive]