Affected by or suffering from fever; intensely hot or flushed; emotionally agitated or excited in an intense way.
From Middle English 'fever' + past participle '-ed.' Originally literal (having fever), but extended metaphorically to describe intense emotion or activity.
When Shakespeare wrote about 'fevered' thoughts or 'fevered' passion, he was using fever as a metaphor for losing control—showing how people have always understood fever as the body going haywire.
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