enthusiasm
It is a credit to her that this unfortunate experience has done nothing to dampen her enthusiasm for her work.
Nothing seems to dampen his enthusiasm for travel.
The challenge did not dampen her enthusiasm, but it fired her up even more.

SMART Vocabulary: related words and phrases

Discouraging and putting off
aversive
dampen someone's spirits
dampener on something
daunt
daunting
deterrence
deterrent
discourage
discouragement
discouraging
disheartening
dishearteningly
disincentive
emasculate
emasculation
pour/throw cold water on somethingidiom
spoke
take the wind out of someone's sailsidiom
throw cold water on somethingidiom
unencouraging