noun
a person who attacks or criticizes traditional or popular beliefs, practices, or institutions
adjective
relating to or characteristic of iconoclasts or iconoclasm
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The artist was considered an iconoclast for challenging traditional artistic norms.
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She's a bit of an iconoclast, always going against the grain.
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That guy is a total iconoclast, he does things his own way no matter what.
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In the world of fashion, she is seen as an iconoclast, constantly pushing boundaries and breaking rules.