In a fanatical manner; with extreme, irrational zeal or enthusiasm.(adverb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "fanatically" in a sentence
"Are you so bent on enforcing some kind of fanatically rigid set of PC rules that you can't allow people to make the most innocuous and obvious kinds of observations that involve some reference to their identity without punishing them for it?"
"They actually revile any people who support the party by association, a dangerously kind of fanatically partisan approach to politics."
"There are other ideas besides that of making freedom national and slavery sectional to which Mr. Seward has been "fanatically" attached, and one of these is, happily for both parties concerned, that a war between "the American and European branch of the British race" would be a fearful crime on the part of those responsible for its occurrence."