acquiescence
activity
agreeability
agreeableness
alacrity
amenability
amusement
animation
ardency
ardor
avidity
brio
briskness
bug
calenture
cathexis
cheerful consent
compliance
concern
concernment
consent
cooperativeness
craze
crazy fancy
curiosity
devotedness
devotion
diversion
docility
eagerness
earnest
earnestness
ebullience
ecstasy
elan
enthusiasticalness
excitement
exuberance
fad
fanaticism
fascination
favorable disposition
favorableness
fervency
fervor
fieriness
fire
forwardness
enthuse
enthusiast
enthusiastic
enthusiastically
admiration
anger
energy
imagination
impulse
passion
pride
zeal