verb
to manipulate someone by psychological means into questioning their own sanity
adjective
having been manipulated by psychological means into questioning one's own sanity
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The victim felt like they were being gaslit by the manipulative individual.
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She thought her friends were gaslighting her when they denied making plans with her.
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He was gaslit by his ex-girlfriend into thinking he was the one at fault.
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The political candidate attempted to gaslight the public by denying any involvement in the scandal.