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Definition of fanatical : Characteristic of, or relating to, fanaticism; fanatic.

Synonyms:

infatuated, bigoted, ultra, dogmatic, headstrong, fiery, militant, wild, arbitrary, raving, mad, edge, ultraist, partial, impassioned, one-ideaed, maniacal, opinionated, frenzied, tenacious, partisan, hard-line, feverish, narrow-minded, of the lunatic fringe, revolutionary, fervid, concern, wild-eyed, politics, devoted, positive, monomaniacal, overzealous, passionate, possessed, far-out, die-hard, overenthusiastic, biased, radical, burning, extremist, stubborn, fanatic, obsessed, extreme, prejudiced, immoderate, rabid, obstinate, excessively enthusiastic, singleminded

enthusiastic, excited, eager, ardent, fervent, zealous, spirited

Usage examples:

• Replying to this fanatical charge in 1553, Melanchthon emphasized the fact that the doctrinal pledges demanded at Wittenberg had been introduced chiefly by Luther, for the purpose of " maintaining the true doctrine." - "Historical Introductions to the Symbolical Books of the Evangelical Lutheran Church", Friedrich Bente.
• They have a right to be fanatical, for their religion is a great protection to them. - "Travels in the Great Desert of Sahara, in the Years of 1845 and 1846", James Richardson.
• The blind and fanatical devotions which Gertrude was able to excite when she set herself to it, was only too well known to Delia. - "Delia Blanchflower", Mrs. Humphry Ward.