"Who is that man?" she asked pointing in the direction of a tall, deranged looking man. "that's Harry Styles, I hear he has a Mania" ♡ ma·ni·a noun: mania mental illness marked by periods of great excitement, euphoria, delusions, and overactivity. synonyms: madness, derangement, dementia, insanity, lunacy, psychosis, mental illness; More delirium, frenzy, hysteria, raving, wildness "fits of mania" an excessive enthusiasm or desire; an obsession. plural noun: manias "he had a mania for Younger Girls" synonyms: obsession, compulsion, fixation, fetish