Synonyms for Unmindful (same or very similar meaning)
WordNet sense 1 (not mindful or attentive):
forgetful, mindlessWordNet sense 2 ((followed by `to' or `of') lacking conscious awareness of):
obliviousWordNet sense 3 ((often followed by `of') not aware):
unaware, incognizantFrom the ODE community, based on WordNetadd/edit