1. fail-safe

noun. (ˈfeɪlˌseɪf) A mechanism capable of returning to a safe state in case there is a failure or malfunction.
Synonyms
mechanism
Antonyms
vulnerable unsound

2. fail-safe

adjective. (ˈfeɪlˌseɪf) Guaranteed not to fail.
Synonyms
secure
Antonyms
insecure injured

3. fail-safe

adjective. (ˈfeɪlˌseɪf) Eliminating danger by compensating automatically for a failure or malfunction.
Synonyms
safe
Antonyms
dangerous harmful

4. fail

verb. (ˈfeɪl) Fail to do something; leave something undone.
Synonyms
neglect default on miss lose track strike out muff choke default
Antonyms
keep track pay up attend clean carry to term

5. fail

verb. (ˈfeɪl) Be unsuccessful.
Synonyms
flop fall flat bollix up bollix founder flub take it on the chin muff fall fluff go wrong bodge bollocks up fumble muck up fuck up miscarry bollocks bobble fall through bungle botch mishandle botch up ball up foul up blow strike out bumble overreach miss shipwreck louse up spoil screw up mess up
Antonyms
succeed appear take office strengthening die

6. safe

adjective. (ˈseɪf) Free from danger or the risk of harm.
Synonyms
riskless unhurt fail-safe uninjured unhazardous safe and sound risk-free secure harmless invulnerable off the hook
Antonyms
harmful injured vulnerable insecure dangerous
Etymology
safe (English)
safe (Middle English (1100-1500))

7. safe

noun. (ˈseɪf) Strongbox where valuables can be safely kept.
Synonyms
deedbox strongbox
Antonyms
unzip unlock unfasten
Etymology
safe (English)
safe (Middle English (1100-1500))

8. fail

verb. (ˈfeɪl) Disappoint, prove undependable to; abandon, forsake.
Synonyms
disappoint let down betray
Antonyms
inflate lengthen accelerate strengthen

9. fail

verb. (ˈfeɪl) Stop operating or functioning.
Synonyms
go bad pass away break go down blow out die pass give-up the ghost go give out choke kick the bucket cash in one's chips crash exit decease perish misfire malfunction pop off give way buy the farm croak snuff it break down blow conk burn out conk out misfunction change expire drop dead
Antonyms
function stay rise ascend explode

10. safe

adjective. (ˈseɪf) (of an undertaking) secure from risk.
Synonyms
unadventurous
Antonyms
adventurous broken
Etymology
safe (English)
safe (Middle English (1100-1500))
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