ignorant
Entry from World dictionary
Pronunciation:/ˈɪgn(ə)r(ə)nt/
adjective
- 1 lacking knowledge or awareness in general; uneducated or unsophisticated:he was told constantly that he was ignorant and stupid
- [predic.] lacking knowledge, information, or awareness about something in particular:I was largely ignorant of the effects of radiotherapy
- 2 informal discourteous or rude:this ignorant, pin -brained receptionist
- 3 black English easily angered:I is an ignorant man — even police don't meddle with me

Derivatives
ignorantly
adverb

Origin:
late Middle English: via Old French from Latin ignorant- 'not knowing', from the verb ignorare (see ignore)