From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( a.) Very ardent; very eager or urgent; very fervent; passionate; as, a vehement affection or passion.

(2): ( a.) Acting with great force; furious; violent; impetuous; forcible; mighty; as, vehement wind; a vehement torrent; a vehement fire or heat.

King James Dictionary [2]

VE'HEMENT, a. L. vehemens.

1. Violent acting with great force furious very forcible as a vehement wind a vehement torrent a vehement fire or heat. 2. Very ardent very eager or urgent very fervent as a vehement affection or passion vehement desire vehement eloquence.

Vine's Expository Dictionary of NT Words [3]