unobservant

from WordNet (r) 3.0 (2006)

unobservant
    adj 1: not consciously observing; "looked through him with blank
           unseeing eyes" [syn: {unobservant}, {unseeing}]

from The Collaborative International Dictionary of English v.0.48

Unobservant \Unobservant\
   See {observant}.

from Moby Thesaurus II by Grady Ward, 1.0

34 Moby Thesaurus words for "unobservant":
      careless, disregardant, disregardful, distracted, distrait,
      heedless, inadvertent, inattentive, inconstant, incurious,
      indifferent, inobservant, negligent, nonadherent, noncompliant,
      nonconforming, nonobservant, regardless, thoughtless, uncompliant,
      unconforming, unfaithful, unheedful, unheeding, unloyal, unmarking,
      unmindful, unnoticing, unnoting, unobserving, unperceiving,
      unremarking, untrue, unwatchful