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Synonyms for make sure
verb make sure

find out
confirm
verify
determine
divine
dig
eye
read
fix

discover
tell
see
settle
identify
learn
peg
establish
check

size
check out
pick up
double-check
eyeball
learn the ropes
catch on
check up on
get down cold

get down pat
get hold of
get it down
get the hang of
look-see
make certain
pick up on
size up

Antonyms for make sure

disprove
invalidate
misunderstand
destroy
unsettle

ignore
aid
assist
look away
neglect

help
miss
overlook
confuse

Synonyms
verb make certain

insure
confirm
ensure
secure
guarantee

set
complete
lock
clinch
ice

cinch
seal
nail down
have a lock on
lock on

lock up
put on ice

Antonyms

halt

Synonyms
verb inspect, examine

find out
probe
go through
monitor
confirm
verify
review
scrutinize
correct

try
investigate
test
analyze
study
case
count
compare
prove

overlook
quiz
note
audit
frisk
ascertain
candle
tell
look at

eyeball
balance account
enquire about
keep account
look over
look see
scout out
take stock

Antonyms

ignore
disprove
invalidate
estimate
guess

aid
assist
expedite
liberate
permit

forget
neglect
allow
help
indulge

Synonyms
verb ratify, validate, prove

certify
uphold
affirm
verify
explain
substantiate
back
sign
corroborate
establish
endorse

approve
support
attest
buy
okay
debunk
underpin
bless
subscribe
vouch
settle

authenticate
sanction
warrant
check
witness
justify
bear out
check out
thumbs up
circumstantiate
double-check

give green light
give high sign
give stamp of approval
give the go-ahead
give the nod
lap up
make good
rubber-stamp
sign off on
size up

Antonyms

contradict
deny
invalidate
reject
disprove
disallow
disapprove

refuse
veto
refute
annul
destroy
repudiate
discredit

confuse
oppose
disagree
cancel
void

Synonyms
verb guarantee; make secure

insure
protect
secure
provide
assure
safeguard

establish
certify
okay
confirm
clinch
effect

guard
cinch
warrant
arrange
nail down
lock on

lock up
make certain
make safe
put on ice
set out

Antonyms

harm
injure
endanger
contradict
deny

invalidate
reject
repudiate
veto
ignore

hurt
forget
neglect

Synonyms
verb make inquiries

check out
investigate

look into
pursue

find out about

Antonyms

avoid

dodge

forget

Synonyms
verb pledge, promise

insure
protect
secure
prove
support
assure
maintain
ensure
attest
certify
guaranty

angel
reassure
back
evidence
juice
evince
wager
witness
mortgage
confirm
stake

testify
endorse
aver
warrant
grubstake
bankroll
affirm
swear
answer for
vouch for
cosign

be surety for
bind oneself
get behind
give bond
make bail
make certain
pick up the check
pick up the tab
sign for
stand behind
stand up for

Antonyms

harm
injure
deny
contradict
invalidate
reject

repudiate
disprove
refute
veto
hurt
let go

neglect
discourage
oppose
break

Synonyms
verb obtain

insure
capture
buy
get
win
assure
ensure
gain

have
take
achieve
guarantee
grasp
land
annex
lock

acquire
procure
access
hook
bag
cinch
catch
chalk up

come by
pick up
rack up
get hold of
lock up

Antonyms

misunderstand
forfeit
release
unlock
loosen
endanger

harm
injure
lose
fail
miss
pass

let go
give up
loose
unfasten
untie
hurt

Synonyms
verb confirm, validate

find out
authenticate
prove
substantiate
certify
corroborate
demonstrate
establish

check
justify
attest
peg
eye
support
try
debunk

settle
test
document
size
bear out
check out
hold up
pan out

double-check
eyeball
add up
check up
check up on
make certain
size up
stand up

Antonyms

conceal
hide
disprove

contradict
deny
invalidate

reject
discredit
confuse

Usage Notes

Both sure and surely are used as intensifying adverbs with the sense “undoubtedly, certainly.” In this use, sure is generally informal and occurs mainly in speech and written representations of speech: She sure dazzled the audience with her acceptance speech. It was sure hot enough in the auditorium. Surely is used in this sense in all varieties of speech and writing, even the most formal: The court ruled that the law was surely meant to apply to both profit-making and nonprofit organizations. See also quick, slow.