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Definition of erratic : 1. A rogue.
2. 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 bowlder.
3. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
4. Having no certain course; roving about without a fixed destination; wandering; moving; - hence, applied to the planets as distinguished from the fixed stars.
5. Irregular; changeable.
6. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.

Synonyms:

spaced-out, weirdo, quicksilver, world-wide, occasional, temporary, unsettled, ridiculous, screwy, episodic, quaint, spasmodic, mercurial, unstable, passing, far-out, planetary, off-kilter, changing, continue, out-of-the-way, hit-or-miss, unreliable, ludicrous, mobile, devious, cranky, changeful, unmatched, world, fantastical, usual, varying, remarkable, short-term, scattered, purpose, moody, temperamental, terrestrial, winding, wandering, meandering, funky, unequal, discontinuous, haphazard, floating, screwball, catch-as-catch-can, unpredictable, aperiodic, wacky, kinky, droll, spotty, patchy, grotesque, transient, helter-skelter, roving, kooky, global, short-lived, comical, change, weird, outré, preposterous, planetal, queerish, crotchety, bizarro, rummy, worldwide, rum, catchy, brief, peregrine, wild, slapdash, off-the-wall, choppy, stray, ticklish, unsteady, aimless, same, casual, way-out, rambling, laughable, offbeat, nomadic, unnatural, fantastic

flighty, wayward, arbitrary, fluctuating, frivolous, fitful, whimsical, fleeting, sporadic, random, scatterbrained, fanciful

shaking, skittish, agitated, spastic, restless, upset, nervous, jittery, disquieted, perturbed, shivering, palpitating, quavering, quivering, uneasy, twitching, quaking, fluttered, writhing, wobbling, jumpy, churned, unquiet, convulsive, disturbed, distraught, twitchy, shaken, troubled, jerky, jarred, shuddering, feverish, trembling

unrhythmical, intermittent, unsystematic, variable, inconstant, uneven, desultory, asymmetric

indecisive, unresolved, halfhearted, changeable, shy, ambivalent, infirm, undecided, unsure, insipid, uncertain, vacillating, shifty, irresolute, spineless, fickle, irresponsible, shilly-shally, yellow, unwilling, capricious, impulsive, dillydallying, shrinking, undependable, watery, fly-by-night, double-minded, weak, volatile, hesitant, tentative, flitting

freakish, quirky, curious, idiosyncratic, uncustomary, bizarre, unusual, different, incongruous, inconsistent, unconventional, funny, aberrant, un-ordinary, odd, divergent, off, crosspatch, crazy, misfit, deviant, outlandish, atypical, oddball, singular, novel, fey, uncommon, deranged, oddity, queer, incompatible, anomalous, improper, mismatch, strange, eccentric, nonconforming, out of the ordinary, untypical, exceptional, unique, extraordinary, abnormal, peculiar, irregular, unfamiliar

Usage examples:

• I am erratic, and careless, and forgetful. - "More About Peggy", Mrs G. de Horne Vaizey.
• We also made several excursions in the neighborhood, in order to study the erratic phenomena and the traces of glaciers, which everywhere cover the surface of the country. - "Louis Agassiz: His Life and Correspondence", Louis Agassiz.
• To this wild doctrine, one erratic Irishman yields a full assent; and, in one American grammatist, we find a partial and unintentional concurrence with it. - "The Grammar of English Grammars", Goold Brown.