Wordnet 3.0
ADJECTIVE (1)
1. 
 not punctual; 
 after the appointed time; 
The Collaborative International Dictionary of English v.0.48:
Unpunctual \Unpunctual\
   See punctual.
WordNet (r) 3.0 (2006):
unpunctual
    adj 1: not punctual; after the appointed time [ant: punctual]