As an adjective fanatical
is having an extreme, irrational zeal or enthusiasm for a specific cause.
As a verb fanaticize is
to make into a fanatic.
fanatical
English
Adjective
(
en adjective)
having an extreme, irrational zeal or enthusiasm for a specific cause
fanaticize
English
Alternative forms
* (UK) fanaticise
Verb
(fanaticiz)
To make into a fanatic
To cause to be fanatical