Not easily relied or depended on

an undependable worker; an undependable lamp socket.

not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"[syn: unreliable ][ant: dependable ]

liable to be erroneous or misleading; "an undependable generalization"

adjective

dependable , reliable , responsible , trustworthy

adjective

bum , capricious , careless , changeable , dubious , erratic , fickle , fly-by-night * , inconsistent , inconstant , indefinite , indeterminate , loose * , no bargain , no-good , treacherous , trick , tricky , trustless , unassured , uncertain , unpredictable , unreliable , unsafe , unsound , unstable , unsure , untrustworthy , variable , flighty , irresponsible , lesser , lower , pinned , secondary , untrusty