A person who pretends to be someone else or claims to have skills or achievements they don't actually have.
From French 'imposteur,' from Latin 'imponere' (to impose or place upon). The sense is of someone 'placing' themselves into a false position or role.
Fun fact: there's actually a psychological phenomenon called 'imposter syndrome' where successful people feel like they're fakes—the word 'imposter' is so powerful that it describes not just dishonest people but our internal doubts about whether we deserve our achievements!
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