ve·he·ment 
(vēə-mənt)
(vēə-mənt)adj.
Characterized by forcefulness of expression or intensity of emotion or conviction; fervid: a vehement denial.
[Middle English, from Old French, from Latin vehemēns, vehement-, perhaps from vehere, to carry; see wegh- in the Appendix of Indo-European roots.]
vehe·mence, vehe·men·cy n.
vehe·ment·ly adv.