Use 'maniacal' to describe extreme excitement that seems almost crazy or out of control. Her maniacal enthusiasm was infectious during the concert.
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Negative Connotation
'Maniacal' often carries a negative connotation, likening someone's behavior to that of a 'maniac'. His maniacal laughter echoed through the haunted house.
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Not Always Literal
Sometimes 'maniacal' is used figuratively, not implying actual madness but rather intense behavior. Her maniacal dedication to the project surprised everyone.