The Collaborative International Dictionary of English v.0.48:

Unseeing \Unseeing\
   See seeing.

WordNet (r) 3.0 (2006):

unseeing
    adj 1: not consciously observing; "looked through him with blank
           unseeing eyes" [syn: unobservant, unseeing]
    2: lacking sight; "blind as an eyeless beggar" [syn: eyeless,
       sightless, unseeing]

Moby Thesaurus II by Grady Ward, 1.0:

87 Moby Thesaurus words for "unseeing":
   a stranger to, ableptical, amaurotic, asleep, benighted,
   bereft of light, blind, blind to, caught napping, color-blind,
   dark, dead to, deaf to, dim-sighted, eyeless, hemeralopic,
   ill-advised, ill-considered, ill-contrived, ill-devised,
   ill-gauged, ill-judged, impercipient, impolitic, imprudent,
   in darkness, in ignorance of, inadvisable, incognizant,
   inconsiderate, indiscreet, inexpedient, injudicious, insensate,
   insensible, insensible to, irrational, mind-blind, mindless,
   misadvised, misguided, myopic, napping, nonconceiving, not with it,
   nyctalopic, out of it, rayless, reasonless, reckless, senseless,
   shortsighted, sightless, spiritually blind, stark blind,
   stone-blind, thoughtless, unadvised, unaware, unaware of,
   unconscious, unconscious of, unconsidered, undiscerning,
   unenlightened, unforeseeing, unhearing, uninsightful, unknowing,
   unmindful, unmindful of, unobserving, unperceiving, unprehensive,
   unrealizing, unreasonable, unreflecting, unreflective, unsensible,
   unsound, unsuspecting, unthinking, unthoughtful, unwise, unwitting,
   visionless, witless