stimulate:
dissuade,
enervate,
halt,
weaken,
discourage,
tire,
depress,
dull,
bore,
calm,
kill,
hurt,
stop,
dishearten,
destroy,
retard.
noun:
quell,
stunt,
inhibit,
check,
slow,
quench,
repress,
wear,
restrain,
fag,
jade,
tucker,
curb,
undermine,
damp,
kayo,
dull,
suppress,
sap,
still.