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.

adjective. Not observant.

adjective. 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"

attentive  careful  

careless  inattentive  nonobservant  

unperceiving  unperceptive  

11-year  apathetic  bysome  half-shut  hoydenish  

careless  careless  disregardant  disregardful  disregardfully