This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not observant.

Not observant; not attentive; heedless: as, an unobservant traveler or reader.

Not careful to comply with what is prescribed or required: as, one unobservant of etiquette.

Not obsequious.

adj. not consciously observing

"Perhaps that is why, of all the many Jewish holidays, the one that is most observed -- even by those who profess to be "unobservant" -- is Passover and the Passover"

unperceiving    unperceptive   

attentive    careful   

careless    inattentive    nonobservant   

careless    unobserving    inobservant    disregardfully   

bysome    unexcitable    unsurprised    uninterested    lack-lustre    inattentive    unphilosophical    inexact    unconscientious    unimpressible