Synonyms: unobservant, unseeing
Definition: not consciously observing
Usage: looked through him with blank unseeing eyes
Similar words: unperceiving, unperceptive
Definition: lacking perception
Usage: as unperceptive as a boulder
Synonyms: unseeing, sightless, eyeless
Definition: lacking sight
Usage: blind as an eyeless beggar
Similar words: blind, unsighted
Definition: unable to see
Usage: a person is blind to the extent that he must devise alternative techniques to do efficiently those things he would do with sight if he had normal vision--Kenneth Jernigan