go bail
bet one's bottom dollar
betcha
100 percent
bet the farm
certainly
ensure
flatly
insure
guarantee
assure
secure
sureness
in all probability
bet one's boots
belike
cinch
in all likelihood
probably
likely
bet
confident
positively
certitude
stonewall
sure thing
foregone conclusion
certainty
cert
superconfident
hyperprecise
confirmably
clear
rely on
I wis
gtd
positive
clearly
convinced
superprecise
ultraprecise
ascertainable
sure as sugar
I'll be bound
know inside and out
make no mistake
sure as shooting
sure as shit
believe me
sure as the world
assuredly
sure as fate
confirm plus chop
undoubting
convincingly
feel up to
all very well
one hundred percent
strong
make book
lay odds
safe in the knowledge
no doubt
factum
self-assuredly
superexact
preconfirm
precisely
easily
doubtlessly
doubtless
undoubtedly
indubitability
safe bet
critically
damn straight
ultraconfident
look
plainly
appreciate
know whether one is Arthur or Martha
by all means
guaranteeably
take account
home and dry
sure as a gun
ostensive
undoubtfully
definitely
certifiably
100 percent
confident
stonewall
superconfident
hyperprecise
gtd
positive
convinced
superprecise
ultraprecise
ascertainable
sure as shooting
undoubting
all very well
one hundred percent
strong
safe in the knowledge
superexact
ultraconfident
home and dry
ostensive
certainly
flatly
in all probability
belike
in all likelihood
probably
likely
positively
confirmably
clear
I wis
clearly
sure as sugar
sure as shit
sure as the world
assuredly
sure as fate
confirm plus chop
convincingly
no doubt
self-assuredly
precisely
easily
doubtlessly
doubtless
undoubtedly
critically
plainly
by all means
guaranteeably
sure as a gun
undoubtfully
definitely
certifiably
sureness
bet
certitude
sure thing
foregone conclusion
certainty
cert
factum
indubitability
safe bet
bet one's bottom dollar
bet the farm
ensure
insure
guarantee
assure
secure
bet one's boots
cinch
bet
rely on
know inside and out
feel up to
make book
lay odds
preconfirm
look
appreciate
know whether one is Arthur or Martha
take account
English words for 'To be absolutely sure of something'
As you may have noticed, above you will find words for "To be absolutely sure of something". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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insatiable drinker
mug shot
to unsettle
to turn off
Asclepiadaceae
shield volcano
different thing
ticklish
chilly rain
administrative expenses
baffling
outer box
statute law
balaclava
neighbourhood association
ETX
unmasking
thereabout.
to take up the gauntlet
good place (to leave off)
plus-minus
draft dodging
to imprison.
spontaneity.
winning
futsal
In an organized manner
(one's own) idea
old-fashioned doughnut
fused quartz
to take a step backward
tormenting
steering
prawns
lubricant
to jeer at
wastepaper
to be out of breath
adaptable
ibid.
to step aside
sector
scanning
a lot.
again and again
custody
darling
alias
definite
even so