fanatical Meaning, Definition & Usage

  1. adjective satellite marked by excessive enthusiasm for and intense devotion to a cause or idea
    rabid; overzealous; fanatic.
    • rabid isolationist

WordNet

Fa*nat"ic*al adjective
Definitions
  1. Characteristic of, or relating to, fanaticism; fanatic. -Fa*nat"ic*al*ly, adv. -- Fa*nat"ic*al*ness, n.

Webster 1913