Fa‐nat″ic (?), a. [L. fanaticus inspired by divinity, enthusiastic, frantic, fr. fanum fane: cf. F. fanatique. See Fane.] Pertaining to, or indicating, fanaticism; extravagant in opinions; ultra; unreasonable; excessively enthusiastic, especially on religious subjects; as, fanatic zeal; fanatic notions.
But Faith, fanatic Faith, once wedded fast
To some dear falsehood, hugs it to the last. T. Moore.