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From phantasmagoric + -ally or phantasmagorical + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.
phantasmagorically
Today it means: In a manner, or to an extent, typical of phantasmagoria; thus, fantastically or bizarrely Full definition →
Today it means: In a manner, or to an extent, typical of phantasmagoria; thus, fantastically or bizarrely Full definition →
From phantasmagoric + -ally or phantasmagorical + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.