In a delirious manner; in a state of wild excitement or mental confusion.
From 'delirious' (adjective, from Latin 'delirus') + '-ly' (English adverb suffix), creating the adverbial form used to modify verbs and describe how an action is performed.
The adverb 'deliriously' has become almost poetic in modern usage—people say they're 'deliriously happy,' completely reversing the original meaning of mental illness to describe intense joy.
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