droop
fizzle out
put off
dishearten
do cheetah flips
banzai
fall apart
run on empty
go to pieces
sag
demotivate
lose one's bottle
faint
gusto
enthuse
spaz out
triumph
shucky ducky
madness
dampen
rabidity
go off the boil
rabidness
freeze
dial back
oh girl
spring in one's step
discouragement
man down
unenthusiastically
epicaricacy
jump for joy
asemia
counterenthusiasm
hot diggety dog
knock the stuffing out of
elate
apathy
dispirit
intoxicate
send
razzed
simmer down
put the brakes on
overenchantment
gush
hooraw
drive
yabba dabba doo
shot in the arm
wahey
aww yeah
slump
far out
cool
hot dog
devalue
felicitation
oh yeah
joydom
cool off
choke up
take one's eye off the ball
cool down
overexcite
wipe the smile off someone's face
right on
set pulses racing
adrenaline
exhortative
quail
unglorify
falter
trip out
clap out
yeah
yahoo
tiger in one's tank
boo-ya
exhilarant
go bonkers
fervent
glorify
laud
overexuberance
rousing
extol
turn on
exalt
discourage
be bothered
proclaim
doolally
get a charge out of
whooee
joyful
stirring
razzed
exhilarant
fervent
rousing
doolally
joyful
stirring
unenthusiastically
gusto
madness
rabidity
rabidness
spring in one's step
discouragement
epicaricacy
asemia
counterenthusiasm
apathy
overenchantment
banzai
triumph
shot in the arm
felicitation
joydom
adrenaline
exhortative
tiger in one's tank
overexuberance
droop
fizzle out
put off
dishearten
do cheetah flips
fall apart
run on empty
go to pieces
sag
demotivate
lose one's bottle
faint
enthuse
spaz out
triumph
dampen
go off the boil
freeze
dial back
man down
jump for joy
knock the stuffing out of
elate
dispirit
intoxicate
send
simmer down
put the brakes on
gush
drive
slump
cool
devalue
cool off
choke up
take one's eye off the ball
cool down
overexcite
wipe the smile off someone's face
set pulses racing
quail
unglorify
falter
trip out
clap out
go bonkers
glorify
laud
extol
turn on
exalt
discourage
be bothered
proclaim
get a charge out of
English words for 'To lose all energy, enthusiasm or happiness; to flag.'
As you may have noticed, above you will find words for "To lose all energy, enthusiasm or happiness; to flag.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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