ζέω G2204
zéō · dzeh'-o · Verb
a primary verb; to be hot (boil, of liquids; or glow, of solids), i.e. (figuratively) be fervid (earnest):--be fervent.
2 Occurrences in the King James Bible
Acts 18:25This man was instructed in the way of the Lord; and being fervent in the spirit, he spake and taught diligently the things of the Lord, knowing only the baptism of John.
Romans 12:11Not slothful in business; fervent in spirit; serving the Lord;