dependable, reliable

unreliable, erratic, ineffective, untrustworthy, inefficient, dependable, inconstant, insecure, unpractical, spotty, ineffectual, inept, reliable, flaky, reliant, nonexistent, inconsistent, unpredictable, temperamental, unproductive, unstable, dependent, inflexible, useless, inadequate, impotent, unfriendly, inconvenient, unremunerative, indecisive, indispensable, feckless, inarticulate, undynamic, expendable, dysfunctional, uncommunicative, incommunicative, nonfunctional, hopeless, incompetent, inexpert, balky, unpunctual, incapable, inaccessible, problematic, absentminded, unintelligent, unfocused, untrusting, disinterested, uncreative, obsolescent, exasperating, inopportune, friendless, unbalanced, lousy, inexperienced, inoperative, clueless, serviceable, undisciplined, maladapted, unaccountable, unsusceptible, hamstrung, unconfident, unimaginative, undedicated, unsynchronised, scarce, unworthy, unmotivated, fickle, indecipherable, untenable, mercurial, overworked, unprincipled, impractical, obsolete, ingrown, irrelevant, unaffordable, outmoded, inexplicable, addlepated, undrinkable, impermanent, unknowledgeable, unuseable, predictable, poor, iffy, immature, uninteresting, overtaxed, unusable, flighty, uncompetitive, fallible, trustworthy, shiftless, disreputable, changeable, secretive, unsocial, amenable, cantankerous, cranky, despicable, irresponsible, lackadaisical, loyal

betray, fail, undependably, unfaithfully, unreliably

erratic, fallible, temperamental, uncertain, unreliable, unsound, untrustworthy, untrusty