adjective
1.
lacking knowledge or education
an ignorant boy with no taste for school
Synonyms: benighted, empty-headed, illiterate, know-nothing, rude, uneducated, uninstructed, unlettered, unschooled, untaught, untutored
Related Word: lowbrow, uncultured, unintellectual; callow, green, inexperienced; crude, gross, raw, uncouth; ingenuous, naive, simple, unsophisticated
Contrasted words: educated, erudite, learned, literate
2.
lacking information on or awareness of something
was ignorant of the circumstances surrounding the affair
Synonyms: incognizant, inconversant, oblivious, unacquainted, unaware, unfamiliar, uninformed, uninstructed, unknowing, unwitting
Idioms: in the dark
Contrasted words: aware, conscious, conversant, informed, knowing, knowledgeable
3.
Synonyms: backward 5, benighted, unenlightened, unprogressive