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reliable

/ɹɪˈlaɪəbəl/
noun
  1. Something or someone reliable or dependable

    "the old reliables"

adjective
  1. Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy

  2. (of a communication protocol) Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't

Synonymsdependable, secure, trustworthy, trusty
Antonymsunreliable

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