WordNet (r) 3.0 (2006):

unreceptive
    adj 1: not receptive [ant: open, receptive]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "unreceptive":
   closed, closed to, impersuadable, impersuasible, impervious,
   inflexible, inhospitable, obstinate, unamenable, uncordial,
   unfriendly, ungracious, unhospitable, unimpressionable,
   uninfluenceable, unmovable, unneighborly, unpersuadable, unpliable,
   unresponsive, unsuggestible, unsusceptible, unswayable,
   unyielding