not worthy of reliance or trust(a)
Synonyms: undependable
unreliable
Examples: in the early 1950s computers were large and expensive and unreliable
an undependable assistant
Antonyms: dependable
reliable
Similar: erratic
temperamental
uncertain
unsound
liable to be erroneous or misleading(a)
Synonyms: undependable
unreliable
Examples: an undependable generalization
Similar: fallible