Longman Dictionary of Contemporary English homepage

ignorant

 adjective
     
ig‧no‧rant
1 not knowing facts or information that you ought to know:
an ignorant and uneducated man
ignorant of
Political historians are often rather ignorant of economics.
ignorant about
Many people remain blissfully ignorant about the dangers of too much sun (=happy because they do not know about the dangers).
➔ see usage note ignore
2 caused by a lack of knowledge and understanding:
an ignorant remark
ignorant opinions
3 British English spoken rude or impolite:
ignorant behaviour
—ignorantly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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