ardency
brashness
bullheadedness
ferocity
fierceness
fire
frenzy
fury
haste
headiness
headlongness
hotheadedness
impetuousness
passion
rush
vehemence
violence
élan
impulsiveness
impetuous
impetuously
alacrity
ardor
boldness
bravery
directness
eagerness
earnestness
exuberance
fervor
intrepidity
promptitude
rapidity
rashness
suddenness
vigour
zeal
deliberation