Word Study
unreliable
CIDE DICTIONARY
unreliable, a.
Not reliable; untrustworthy. See Reliable. [1913 Webster]
"Alcibiades . . . was too unsteady, and (according to Mr. Coleridge's coinage) “unreliable;” or perhaps, in more correct English, too “unrelyuponable.”" [1913 Webster]
OXFORD DICTIONARY
unreliable, adj. not reliable; erratic.
Derivative
unreliability n. unreliableness n. unreliably adv.
THESAURUS
unreliable
adrift, afloat, alternating, amorphous, capricious, changeable, changeful, coquettish, dangerous, desultory, deviable, disreputable, dizzy, doubtful, dubious, eccentric, erratic, faddish, faithless, false, falsehearted, fast and loose, fickle, fitful, flickering, flighty, flimsy, flirtatious, flitting, fluctuating, fly-by-night, freakish, garbled, giddy, hazardous, impetuous, impulsive, inaccurate, inauthentic, inconsistent, inconstant, indecisive, inexact, infirm, insecure, insubstantial, irregular, irresolute, irresponsible, light, mazy, mercurial, miscited, misquoted, misreported, misstated, moody, perfidious, perilous, precarious, provisional, questionable, quicksilver, rambling, restless, risky, rocky, roving, scatterbrained, shaky, shapeless, shifting, shifty, shuffling, skittish, slick, slippery, spasmodic, spineless, spurious, temporary, tentative, ticklish, tottery, toying, treacherous, tricky, trustless, unaccountable, unassured, unauthentic, unauthoritative, uncertain, uncontrolled, undependable, undisciplined, unfaithful, unfaithworthy, unfixed, unfounded, unhealthy, unpredictable, unrestrained, unsafe, unsettled, unsolid, unsound, unstable, unstable as water, unstaid, unsteadfast, unsteady, unsubstantial, unsure, untrue, untrustworthy, untrusty, vacillating, vagrant, variable, versatile, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, weak, whimsical, wishy-washy, workadayROGET THESAURUS
unreliable
Uncertainty
N uncertainty, incertitude, doubt, doubtfulness, dubiety, dubitation, dubitancy, dubitousness, hesitation, suspense, perplexity, embarrassment, dilemma, bewilderment, timidity, vacillation, diaporesis, indetermination, vagueness, haze, fog, obscurity, ambiguity, contingency, dependence, dependency, double contingency, possibility upon a possibility, open question, onus probandi, blind bargain, pig in a poke, leap in the dark, something or other, needle in a haystack, needle in a bottle of hay, roving commission, precariousness, fallibility, uncertain, casual, random, changeable, doubtful, dubious, indecisive, unsettled, undecided, undetermined, in suspense, open to discussion, controvertible, in question, vague, indeterminate, indefinite, ambiguous, equivocal, undefined, undefinable, confused, mystic, oracular, dazed, perplexing, enigmatic, paradoxical, apocryphal, problematical, hypothetical, experimental, unpredictable, unforeseeable (unknowable), fallible, questionable, precarious, slippery, ticklish, debatable, disputable, unreliable, untrustworthy, contingent, contingent on, dependent on, subject to, dependent on circumstances, occasional, provisional, unauthentic, unauthenticated, unauthoritative, unascertained, unconfirmed, undemonstrated, untold, uncounted, in a state of uncertainty, in a cloud, in a maze, bushed, off the track, ignorant, afraid to say, out of one's reckoning, astray, adrift, at sea, at fault, at a loss, at one's wit's end, at a nonplus, puzzled, lost, abroad, d_esorient_e, distracted, distraught, pendente lite, sub spe rati, Heaven knows, who can tell? who shall decide when doctors disagr.For further exploring for "unreliable" in Webster Dictionary Online