Know Your Next Word : zealous
12. zealous :
enthusiastically devoted to something, fervent
The zealous young policeman made so many arrests that the city jail soon became overcrowded.
The dictator's followers were so zealous that if he had asked them all to jump off a cliff, most of them would have done so.
To be zealous is to be full of zeal or fervent enthusiasm. An overly zealous person is a zealot.
He may be zealous in the salvation of souls.