Antonyms of adj unreliable

4 senses of unreliable

Sense 1
undependable, unreliable -- (liable to be erroneous or misleading; "an undependable generalization")

INDIRECT (VIA fallible) -> infallible -- (incapable of failure or error; "an infallible antidote"; "an infallible memory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible")

Sense 2
unreliable (vs. reliable), undependable (vs. dependable) -- (not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant")

reliable (vs. unreliable), dependable (vs. undependable) -- (worthy of reliance or trust; "a reliable source of information"; "a dependable worker")
        => certain, sure -- (reliable in operation or effect; "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites")
        => tested, time-tested, tried, tried and true -- (tested and proved to be reliable)
        => undeviating -- (used of values and principles; not subject to change; steady; "undeviating loyalty")

Sense 3
treacherous, unreliable -- (dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle")

INDIRECT (VIA dangerous) -> safe -- (free from danger or the risk of harm; "a safe trip"; "you will be safe here"; "a safe place"; "a safe bet")

Sense 4
unreliable -- (lacking a sense of responsibility)

INDIRECT (VIA irresponsible) -> responsible -- (worthy of or requiring responsibility or trust; or held accountable; "a responsible adult"; "responsible journalism"; "a responsible position"; "the captain is responsible for the ship's safety"; "the cabinet is responsible to the parliament")

Similarity of adj unreliable

4 senses of unreliable

Sense 1
undependable, unreliable -- (liable to be erroneous or misleading; "an undependable generalization")
       => fallible (vs. infallible) -- (likely to fail or make errors; "everyone is fallible to some degree")

Sense 2
unreliable (vs. reliable), undependable (vs. dependable) -- (not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant")
       => erratic, temperamental -- (likely to perform unpredictably; "erratic winds are the bane of a sailor"; "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute"- Osbert Lancaster)
       => uncertain -- (not consistent or dependable; "an uncertain recollection of events"; "a gun with a rather uncertain trigger")
       => unsound -- (of e.g. advice)
          Also See-> untrustworthy#1, untrusty#1

Sense 3
treacherous, unreliable -- (dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle")
       => dangerous (vs. safe), unsafe -- (involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions")

Sense 4
unreliable -- (lacking a sense of responsibility)
       => irresponsible (vs. responsible) -- (showing lack of care for consequences; "behaved like an irresponsible idiot"; "hasty and irresponsible action")