In a way that shows wild excitement, panic, or desperate energy; moving or acting with extreme haste and urgency.
From 'frantic,' which comes from Middle English and Greek 'phrenitis' (inflammation of the brain), implying a state of mental distress that makes you act wildly.
The word originally meant you were literally brain-sick in Greek, which is a pretty intense way to describe how your mind feels when you're panicking—ancient medicine was very dramatic.
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