Douglas Harper's Etymology Dictionary
Wiktionary
a. Not observant.
WordNet
adj. not consciously observing; "looked through him with blank unseeing eyes" [syn: unseeing]
not paying attention [syn: inattentive, unvigilant, unwatchful]
Usage examples of "unobservant".
And it ocomed to her how truly unobservant most people were, including herself.
She stood beside King Danube and told the story of her first meeting with Avelyn, when he was known as the Mad Friar, little more than a drunken brawler to the unobservant, but in truth a man who had learned to see clearly the errant course of the Abellican Church and was trying, in any way he could find, to illuminate the people of the world.
Emperor Alexander, who was neither unobservant nor devoid of humour, gave Vassily a Breguet watch as a token of thanks for his carefully unspecified services.
But my father, who had been a silent but not unobservant witness of all this scene, coming to the conclusion that after what had happened we should scarcely be welcome there, and that the company of Pereira was to be avoided just now, went up to Marais and bade him farewell, saying that we would send for my mare.
Pshaw, my dear fellow, what do the public, the great unobservant public, who could hardly tell a weaver by his tooth or a compositor by his left thumb, care about the finer shades of analysis and deduction!
Edmund, between his theatrical and his real part, between Miss Crawford's claims and his own conduct, between love and consistency, was equally unobservant.