fre·net·ic or phre·net·ic (frə-nět'ĭk) adj. Wildly excited or active; frantic; frenzied.
[Middle English frenetik, from Old French frenetique, from Latin phrenēticus, from Greek phrenītikos, from phrenītis, brain disease, from phrēn, mind; see gwhren- in Indo-European roots.] fre·net'i·cal·ly adv., fre·net'i·cism (-ĭ-sĭz'əm) n.
phre·net·ic (frə-nět'ĭk) adj. Variants of frenetic.
c.1374, from O.Fr. frenetike, from L. phreneticus "delirious," alteration of Gk. phrenitikos, from phrenitis "frenzy," lit. "inflammation of the brain," from phren "mind, reason" + -itis. The classical ph- was restored mid-16c.
phrenetic
c.1374, from O.Fr. frenetike, from L. phreneticus, from Gk. phrenetikos "mad, delirious, frantic," from phren (gen. phrenos) "diaphragm, heart, mind," of unknown origin. A doublet of frantic.