1. Highly excited with strong emotion or frustration; frenzied: frantic with worry.
2. Characterized by rapid and disordered or nervous activity: made a frantic last-minute search for the lost key.
3. Archaic Mentally deranged.
[Middle English frantik, from Old French frenetique, from Latin phrenēticus; see FRENETIC.]
franti·cal·ly, frantic·ly adv.
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