noun
the quality or state of being grand or extravagant
adjective
grandiose
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The dictator's grandiosity was evident in the elaborate ceremonies he held to showcase his power.
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Her grandiosity knows no bounds when she starts talking about her accomplishments.
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Don't let his grandiosity fool you, he's just all talk and no action.
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The grandiosity of the mountain range took my breath away as I stood at the summit.