Erratic1. (a.) Irregular; having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.
2. (a.) Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
3. (a.) Irregular; changeable.
4. (n.) One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
5. (n.) A rogue.
6. (n.) Any stone or material that has been borne away from its original site by natural agencies; esp., a large block or fragment of rock; a bolder.
Thesaurus Entries
aberrant, aberrative, abnormal, adrift, afloat, agnostic, aimless, alternating, ambiguous, amorphous, anomalistic, anomalous, bizarre, broken, capricious, careening, casual, catchy, chancy, changeable, changeful, changing, character, choppy, circuitous, crackpot, crank, crankish, cranky, crotchety, curving, departing, desultory, deviable, deviant, deviating, deviative, deviatory, devious, dicey, different, digressive, directionless, disarticulated, disconnected, discontinuous, discursive, disjunct, disordered, disorderly, dispersed, disproportionate, divagatory, divaricate, divergent, diversified, diversiform, dizzy, dotty, doubtful, doubting, dubious, eccentric, equivocal, erose, errant, exceptional, excursive, extraordinary, fast and loose, fey, fickle, fitful, flake, flaky, flickering, flighty, flitting, fluctuant, fluctuating, formless, freak, freakish, frivolous, funny, giddy, gratuitous, guttering, halting, haphazard, herky-jerky, hesitant, hesitating, heteroclite, heteromorphic, hit-or-miss, idiocratic, idiosyncratic, iffy, immethodical, impetuous, impulsive, incalculable, inchoate, incoherent, inconsistent, inconstant, indecisive, indemonstrable, indirect, indiscriminate, infirm, intermittent, intermitting, irregular, irresolute, irresponsible, jagged, jerky, kinky, kook, kooky, labyrinthine, lurching, maggoty, mazy, meandering, meaningless, mercurial, misshapen, moody, motley, mutable, nonconformist, nonstandard, nonsymmetrical, nonsystematic, nonuniform, nut, nutty, odd, oddball, orderless, out-of-the-way, outlandish, patchy, peculiar, planetary, planless, pluralistic, polysemous, promiscuous, quaint, queer, quirky, ragged, rambling, random, recluse, restless, rough, roundabout, roving, scatterbrained, scrappy, screwball, screwy, senseless, serpentine, shapeless, shifting, shifty, shuffling, singular, skeptical, snaky, snatchy, spasmatic, spasmic, spasmodic, spastic, spineless, sporadic, spotty, staggering, straggling, straggly, strange, strange duck, stray, straying, subnormal, swerving, systemless, touch-and-go, turning, twisted, twisting, unaccountable, unarranged, uncertain, unclassified, unconfirmable, uncontrolled, unconventional, unconvinced, undependable, undirected, undisciplined, undivinable, unequable, unequal, uneven, unfixed, unforeseeable, ungraded, unjoined, unmethodical, unmetrical, unnatural, unordered, unorganized, unorthodox, unpersuaded, unpredictable, unprovable, unregular, unreliable, unrestrained, unrhythmical, unsettled, unsorted, unstable, unstable as water, unstaid, unsteadfast, unsteady, unsure, unsymmetrical, unsystematic, ununiform, unusual, unverifiable, vacillating, vagarious, vagrant, vague, variable, variegated, variform, various, varying, veering, vicissitudinary