In a way that shows intense excitement, worry, or activity, like having a fever of emotions or energy.
From 'feverish' (adjective, meaning fever-like or frantic) plus '-ly' (adverb-forming suffix). 'Feverish' comes from Old English 'fefor' (fever) via Latin 'febris'. The '-ly' suffix indicates manner or state. The meaning evolved from literal fever symptoms to metaphorical intense emotional or physical states.
This word perfectly captures how humans describe mental states using body metaphors—we say someone works 'feverishly' even when they have no actual fever! Language constantly borrows from physical sensations to describe emotions and effort, which is why so many adverbs describing intensity come from illness or heat.
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