disenchant
balk
fail
betray
mock
flat out
let down
deflate
disquietive
disapprobative
improbatory
disappointedly
rest
faithless
disapprobatory
unsweet
thumb down
disheartenment
misplease
begeck
best pleased
unsatisfy
dissatisfy
underimpress
demoralising
dispraisingly
blast
rain on someone's parade
piss on someone's bonfire
dispiritment
piss in someone's cornflakes
dischuffed
put off
sorrow
unsurprisingness
disbowel
frustrate
displeased
deprecative
distribute
unapprehensiveness
unhappy
obviativity
dissonate
ungrudgingness
sycophancy
discontent
eesh
take on the chin
discredit