adjective
showing excessive enthusiasm or zeal; extremely devoted or enthusiastic
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The fanatical supporters of the political party would stop at nothing to see their candidate win.
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She's a fanatical fan of that TV show, she never misses an episode.
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Those fanatical gamers are always online, they're addicted to their consoles.
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His fanatical dedication to his work often leads him to neglect other aspects of his life.