Synonyms of 'megalomania'
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Conceit is very great pride in your abilities or achievements that other people feel is too great.
He knew, without conceit, that he was considered a genius.
Egotism is the quality of being egotistic.
his amazing blend of egotism, superciliousness and stupidity
Thesaurus for megalomania from the Collins English Thesaurus
Megalomania is the belief that you are more powerful and important than you really are. Megalomania is sometimes a mental illness.