oblivious

adj. 易忘的,遗忘的,忘却的,健忘的

objectively, objectivity, objector, objet d'art, oblate, obligate, obligation, obligatory, oblige, obliged, obliging, obligingly, oblique, oblique angle, obliquely, obliqueness, obliquity, obliterate, obliteration, oblivion, obliviousness, oblong, obloquy, obnoxious, obnoxiously, obnoxiousness, oboe, oboist, obscene, obscenely, obscenity, obscur, obscure, obscurely, obscurity, obsequies, obsequious, obsequiously, obsequiousness, observable,