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1. having or proceeding from an extreme or fanatical support of or belief in something:

｟非難して｠ 狂信的な, 過激な, 熱烈な〈政治家･愛好者など〉(fanatical)

e.g. the show's small but rabid fan base

e.g. a rabid ideologue

e.g. she's expecting more rabid support from the hometown fans.

2. (of an animal) affected with rabies.

狂犬［恐水］病に感染した〈犬などの動物〉

of or connected with rabies.

rabidity |rəˈbidədē| noun

rabidly |ˈrabədlē| adverb

rabidness noun

early 17th century (in the sense ‘furious, madly violent’): from Latin rabidus, from rabere ‘to rave’.