reliable

Calling something reliable means you can count on it to come through when you need it; it's dependable. If you're headed out for an around-the-world sailing trip, hopefully your lifejacket is reliable.

You can certainly rely on something reliable because it's trustworthy and responsible. Reliable people usually show up on time, never flake out, and always tell the truth. A reliable car isn't likely to break down and will get you from place to place safely. And if you happen to lose your trusty sidekick, good luck looking for a reliable replacement.

Definitions of reliable
  1. adjective
    worthy of reliance or trust
    “a reliable source of information”
    synonyms: dependable
    certain, sure
    reliable in operation or effect
    tested, time-tested, tried, tried and true
    tested and proved to be reliable
    undeviating
    used of values and principles; not subject to change; steady
    trustworthy, trusty
    worthy of trust or belief
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    Antonyms:
    undependable, unreliable
    not worthy of reliance or trust
    erratic, temperamental, wayward
    likely to perform unpredictably
    uncertain
    not consistent or dependable
    unsound
    of e.g. advice
    untrustworthy, untrusty
    not worthy of trust or belief
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  2. adjective
    worthy of being depended on
    “a reliable source of information”
    synonyms: dependable, honest, true
    trustworthy, trusty
    worthy of trust or belief
  3. adjective
    conforming to fact and therefore worthy of belief
    reliable information”
    synonyms: authentic
    trustworthy, trusty
    worthy of trust or belief
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