Synonyms of unreliable in English:

unreliable


See definition of unreliable

adjective

1‘an unreliable group of volunteers’

SYNONYMS
undependable, untrustworthy, irresponsible, reckless, fickle, capricious, irregular, erratic, unpredictable, inconstant, mutable, faithless, untrue, flighty, slippery
ANTONYMS

reliable, steadfast

2‘unemployment can be an unreliable indicator of the tightness of labour markets’

SYNONYMS
questionable, open to question, open to doubt, doubtful, dubious, suspect, unsound, tenuous, flimsy, weak, unsubstantial, implausible, unconvincing, unsupported, unsubstantiated, fallible, shaky, rocky
risky, chancy, disreputable, specious, defective
inaccurate, vague, untrue, incorrect, wide of the mark, off-target, wrong
informal iffy, dicey
British informal dodgy
ANTONYMS

reliable, accurate