1 not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant" [syn: unreliable] [ant: reliable, reliable]
2 not to be trusted [syn: unreliable]
3 liable to be erroneous or misleading; "an undependable generalization" [syn: unreliable]
- The opposite of dependable
Usage notesMore undependable would often be expressed as less dependable and most undependable would often be least dependable.
adrift, afloat, alternating, amorphous, capricious, changeable, changeful, coquettish, dangerous, desultory, deviable, dizzy, doubtful, dubious, eccentric, erratic, faddish, fast and loose, fickle, fitful, flickering, flighty, flirtatious, flitting, fluctuating, fly-by-night, freakish, giddy, hazardous, impetuous, impulsive, inconsistent, inconstant, indecisive, infirm, insecure, insubstantial, irregular, irresolute, irresponsible, light, mazy, mercurial, moody, perilous, precarious, provisional, quicksilver, rambling, restless, risky, rocky, roving, scatterbrained, shaky, shapeless, shifting, shifty, shuffling, skittish, slippery, spasmodic, spineless, temporary, tentative, ticklish, tottery, toying, treacherous, tricky, trustless, unaccountable, uncertain, uncontrolled, undisciplined, unfaithworthy, unfixed, unhealthy, unpredictable, unreliable, unrestrained, unsafe, unsettled, unsolid, unsound, unstable, unstable as water, unstaid, unsteadfast, unsteady, unsubstantial, unsure, untrustworthy, untrusty, vacillating, vagrant, variable, versatile, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, wishy-washy