undependable

Synonyms:

unreliable

erratic, temperamental

likely to perform unpredictably

uncertain

not consistent or dependable

unsound

of e.g. advice

untrustworthy, untrusty

not worthy of trust or belief

Antonyms:

dependable, reliable

worthy of reliance or trust

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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