The Oxford Thesaurus An A-Z Dictionary of Synonyms - rabid adj.

1) unreasonable, unreasoning, extreme, fanatical; raging, furious, violent, crazed, frenzied, maniacal, wild, mad, infuriated, frenetic, berserk: Please don't mention politics to Nigel - he gets rabid on the subject. 2) hydrophobic, mad: Animals from abroad are kept in quarantine to make sure they are not rabid.