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Synonyms for secure
adj safe

protected
guarded
sheltered

defended
immune
impregnable

unassailable
undamaged
unharmed

shielded
riskless
out of harm’s way

Antonyms for secure

endangered
unprotected
unsafe
unstable
indefinite

uncertain
undecided
unsure
insecure
loose

moving
unfastened
unfixed
unsecure

Synonyms
adj fastened, stable

solid
strong
sure
sound
firm
set

locked
fortified
steady
bound
fast
iron

staunch
fixed
immovable
tenacious
tight
adjusted

anchored
nailed
buttoned down
safe and sound
solid as a rock

Antonyms

unstable
changeable
indefinite
irresolute
movable
unsteady
impermanent
endangered

unprotected
unsafe
uncertain
undecided
unsure
soft
flexible
loose

weak
unfixed
broken
insecure
moving
unfastened
unsecure

Synonyms
adj certain, definite

sure
solid
reliable
able
confident
easy
stable
strong
sound
established

assured
steady
firm
determined
cinch
balanced
settled
absolute
carefree
conclusive

hopeful
in the bag
resolute
sanguine
self-assured
self-confident
steadfast
sure thing
tried and true
well-founded

shoo-in
reassured
at ease
locked on
nailed down
on ice
unanxious
undoubtful

Antonyms

uncertain
unsure
wobbly
unreliable
untrustworthy
infirm
feeble
unsound
unstable

irresolute
endangered
unprotected
unsafe
indefinite
undecided
soft
delicate
weak

imbalanced
flexible
wavering
insecure
loose
moving
unfastened
unfixed
unsecure

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
make sure

Antonyms

misunderstand
forfeit
release
unlock
loosen
endanger

harm
injure
lose
fail
miss
pass

let go
give up
loose
unfasten
untie
hurt

Synonyms
verb attach, tie up

fix
clinch
settle
cement
lock
clamp
tighten
adjust

chain
bind
button
tack
hitch
nail
lash
moor

bolt
fasten
close
tie
catch
anchor
padlock
rivet

pinion
batten down
button down
hook on
lock up
make fast
tie down

Antonyms

unsettle
unlock
loosen
release
detach
disjoin
unhitch
disconnect

forfeit
endanger
harm
injure
unfix
unfasten
open
free

let go
loose
untie
unchain
lose
give up
hurt

Synonyms
verb protect, make safe

insure
defend
assure

ensure
safeguard
guarantee

fend
shield
bulwark

screen
cover
guard

Antonyms

uncover
disregard
ignore
forfeit
loosen
endanger
harm

injure
lay bare
open
reveal
forget
give up
lose

let go
loose
unfasten
untie
hurt