frenetic (adj.)

late 14c., frenetik, "temporarily deranged, delirious, crazed," from Old French frenetike "mad, crazy" (13c.), from Latin phreneticus "delirious," alteration of Greek phrenitikos, from phrenitis (nosos) "frenzy, mental disease, insanity," literally "inflammation of the brain," from phrēn "mind, reason," also "diaphragm" (see phreno-) + -itis "inflammation." The classical ph- sometimes was restored from mid-16c. (see phrenetic). Related: Frenetical; frenetically. Compare frantic.