vower
promisor
promiser
promisee
pledge
vow
avower
feku
pledger
grave
solemn
sober
sedate
smoothie
smoothy
Dutch uncle
affirming
charmer
sweet talker
salute
plaster saint
warner
sell
appropriator
oath
stickler
good as one's word
sentiocentrist
pledgor
plamasser
plight
preferrer
meaner
adjuration
promising
conferee
declarant
understudy
assurer
transigent
dedicatee
bemoaning
offeror
bewailing
engage
cedent
perhapser
answerer
pro
admitter
proponent
mispromise
pick a lane
acknowledgement
pragmatist
cross my heart and hope to die
offerer
persuadable
attestant
acknowledgment
attester
today is a good day to die
sweet-talk
skeptic
tattletale
ensure
undertaker
pleasing
rightdoer
lock into
regarder
satisfier
lebai
contributor
commissive
spurner
outer
mad lad
keep
boost
piker
beck
acceptant
well-wisher
encouragement
personifier
word of honor
subscriber
aver
reverence
posturer
sounding board
grave
solemn
sober
sedate
good as one's word
commissive
vower
promisor
promiser
promisee
vow
avower
feku
pledger
pledge
smoothie
smoothy
Dutch uncle
affirming
charmer
sweet talker
plaster saint
warner
appropriator
oath
stickler
sentiocentrist
pledgor
plamasser
preferrer
meaner
adjuration
promising
conferee
declarant
assurer
transigent
dedicatee
bemoaning
offeror
bewailing
cedent
perhapser
answerer
pro
admitter
proponent
acknowledgement
pragmatist
offerer
persuadable
attestant
acknowledgment
attester
sweet-talk
skeptic
undertaker
pleasing
rightdoer
regarder
satisfier
lebai
contributor
spurner
outer
mad lad
boost
piker
beck
acceptant
well-wisher
encouragement
personifier
word of honor
subscriber
posturer
sounding board
pledge
salute
sell
plight
understudy
engage
mispromise
pick a lane
cross my heart and hope to die
tattletale
ensure
lock into
keep
aver
reverence
English words for 'someone who makes a solemn promise to do something or behave in a certain way'
As you may have noticed, above you will find words for "someone who makes a solemn promise to do something or behave in a certain way". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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