FRENETIC Meaning of FRENETIC in English adj.1 frantic, frenzied. 2 fanatic. Derivatives: frenetically adv. Etymology: ME f. OF frenetique f. L phreneticus f. Gk phrenitikos f. phrenitis delirium f. phren phrenos mind Oxford English vocab. Оксфордский английский словарь. 2012