Etymology
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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.

updated on May 28, 2019

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Definitions of frenetic from WordNet

frenetic (adj.)
excessively agitated; distraught with fear or other violent emotion;
frenetic screams followed the accident
Synonyms: frantic / phrenetic / frenzied
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.