noun
a person who lacks knowledge or awareness in general; an ignorant person
adjective
lacking knowledge or awareness in general; uneducated or unsophisticated
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The ignorant decision to ignore expert advice led to disastrous consequences.
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She's so ignorant about current events, she didn't even know about the major news story.
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Don't be so ignorant about what's going on around you.
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His stubbornness made him willfully ignorant to the truth.