(a.) Not reliable; untrustworthy. See Reliable.

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 workaday