Ignorant means knowing nothing about something you ought to know. Ignorant of the facts, wilfully ignorant, an ignorant remark.
In careful use it is neutral and takes of — ignorant of the rules simply means not knowing them. In British speech it has drifted to mean rude, which is a different accusation entirely and causes real misunderstanding. Note the Latin ignorare, not to know.
1adjectiveignorantKnowing nothing about something.
“Many people are ignorant of the dangers of eating too much sugar.”
ignorant is a lack of knowledge.
Latin ignorans comes from ignorare, not to know — in-, not, plus a root meaning to know. Ignore is the same verb.
Proto-Indo-European
*ǵneh₃-
Latin
ignōrāns — unaware, unknowing
Old French
ignorant
English, today
ignorant
From Old French ignorant, from Latin ignōrāns (“unaware, unknowing”). by surface analysis, ignore + -ant.
Etymology from Wiktionary, CC BY-SA