vis (general term, intensive force or strength): gravitas (the impression which anything makes upon the feelings): violentia (violence): ardor: aestus (heat, glow, fire; especially of the passions, a fever, etc.): impotentia (want of self-control): iracundia (vehemence of character, anger): incitatio: impetus (great hurry). [Vid: also, VIOLENCE, HEAT.] ☞ Vehementia (= vis) is first used by Plin.