Full of zeal; ardent, fervent; exhibiting enthusiasm or strong passion. (adjective)
Examples of word zealous
Tonight, 12 House Republican congressmen outraged by what they call the zealous and unjust sentences, they've sent a letter to President Bush.
Yet in this work he can find no words sufficiently strong to praise what he calls the zealous freedom and Christian earnestness of one of the most offensive canters that the whole range of fiction presents.
When he came nearest to the scientific spirit of his time, in zealous observations of the life of nature, he characteristically concentrated on the sequence of various bird notes at daybreak and the flight of moths as the stars of twilight were kindled.
I respectfully suggest that "cult like behavior" is defined as zealous advocacy that leads to magical thinking and imperviousness to fact, you simply cannot beat a Hillary true-believer.
In addition to his witness to the faith under persecution which encouraged the young to persevere, Fr Jia was known as a zealous and devout pastoral priest.