The Collaborative International Dictionary of English v.0.48:

Uninquisitive \Uninquisitive\
   See inquisitive.

WordNet (r) 3.0 (2006):

uninquisitive
    adj 1: not inquiring [syn: uninquiring, uninquisitive] [ant:
           inquiring]
    2: deficient in curiosity [syn: uninquiring, uninquisitive]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "uninquisitive":
   aloof, apathetic, bored, careless, detached, disinterested,
   distant, heedless, impassive, incurious, indifferent, insouciant,
   listless, mindless, phlegmatic, regardless, stolid, unconcerned,
   uninquiring, uninterested, uninvolved, unmindful, withdrawn