1) In a fanatical way 2) With great intensity 3) With keen interest 
• (adv.) In a rabid manner; with extreme violence.
Rab'id·ly (răb'ĭd*lȳ) adverb In a rabid manner; with extreme violence. 
rabidly 1. Irrationally extreme in opinion or practice: 'He has always been a rabid baseball fan.' 2. Furiously or ragingly; violently intense. 3. Affected with or pertaining to rabies; a reference to madness.