7

Is there a single word for "never fails"?

  • 3
    How about "unfailing"? – Roaring Fish Sep 15 '13 at 5:15
13

1- Inerrant

2- Unblemished

3- faultless

4- Indefectible

5- Immaculate

6- Impeccable

7- Flawless

8- Infallible

10

Yes:

unnerring: Committing no mistakes; consistently accurate.

infallible : 2. Incapable of failing; certain: an infallible antidote; an infallible rule.

foolproof: 2. Effective; infallible: a foolproof scheme.

unfailing : 3. Incapable of error; infallible.

  • 1
    I'd forgotten unfailing, despite its being the most obvious, thanks @RoaringFish. – terdon Sep 15 '13 at 5:21
6

I like:

  1. surefire
  2. reliable
  3. rock
  4. guaranteed
0

Foolproof or bulletproof (bulletproof is more metaphorical, of course) can be used depending on the context.

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