mid-16c., an early Modern English restored classical spelling of frenetic (late 14c.). A doublet of frantic.
Entries linking to phrenetic
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.
frantic adj.
mid-14c., "insane," unexplained variant of Middle English frentik (see frenetic). Compare franzy, dialectal form of frenzy. Transferred meaning "affected by wild excitement" is from late 15c. Of the adverbial forms, frantically (1749) is later than franticly (1540s).