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fanatical

fa·nat·i·cal

fanatical

pronunciation:
f nae tih kl
part of speech: adjective
definition: driven by or springing from excessive and uncritical zeal.
The rebel leader was fanatical about his cause.The population grew tired of fanatical speeches.
similar words:
drastic, fanatic, mad, rabid
derivation: fanatically (adv.)