boil, seethe

2 times

(1) Act 18:25
This 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.
ζέων [zeôn] Present Participle Active, nom. sing. masc.
- "and being fervent in the spirit":
    καὶ       ζέων      τῷ    πνεύματι
     kai        zeôn        tô      pneumati
    and       fervent    in the      spirit

(2) Romans 12:11
Not slothful in business; fervent in spirit; serving the Lord;
ζέοντες [zeontes] Present Participle Active, nom. pl. masc.
- "fervent in spirit":
   τῷ     πνεύματι   ζέοντες
    tô       pneumati      zeontes
  in the      spirit           fervent