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What is an alternative, succinct phrase for something that is not prone to errors, i.e. the antonym of error-prone? "Error-free" is too extreme in that it suggests infallibility.

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    What's the context? It may help to find the right connotation. – Bradd Szonye Aug 19 '13 at 16:47
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    @Bradd: I second the call for more context. I might talk about robust software, a dependable truck, a trustworthy counselor, and a secure connection. – J.R. Aug 19 '13 at 21:12
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I think you want:

Reliable 2: giving the same result on successive trials

from m-w.com

Reliability: The probability that a product will perform its specified function under prescribed conditions without failure for a specified period of time.

from APICS.org dictionary (on-line, 13th ed.)

  • +1 However, technical definitions of reliability, robustness and related terms are more relevant to the context than general English dictionary meanings. – Kris Aug 20 '13 at 6:34
  • Agreed and edited as such for "reliability;" cannot find justification to match "robustness" with the OP based on my source. Please update if you can improve on this. – Jack Ryan Aug 20 '13 at 11:47
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    linfo.org/robust.html – Kris Aug 21 '13 at 5:53
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Reliable, steady, stable, or high-quality may work, depending on the context. If that's not quite right, try those words as a starting point in a thesaurus.

  • Downvoter: Can you please offer feedback that would help improve the answer? I'm frankly puzzled that this got a downvote when it includes the same word as the upvoted and accepted answer. – Bradd Szonye Aug 20 '13 at 8:28
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What about "safer"? I know it's not specific to the pass/fail rate of a working unit, but it does imply that it's fairly good but definitely not perfect.

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I like peerless for describing a human trait.

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