Unsteady

Adjective

 * 1) Not held firmly in position.
 * 2) Noted for lack of regularity or uniformity.
 * 3) Inconstant in purpose, or volatile in behaviour.

Antonyms

 * steady

Verb

 * 1) To render unsteady, removing balance.

Thesaurus
adrift, afloat, alternating, amorphous, broken, canted, capricious, careening, catchy, changeable, changeful, changing, choppy, dancing, dangerous, desultory, deviable, deviating, deviative, deviatory, different, dilapidated, disconnected, discontinuous, disorderly, divaricate, divergent, diversified, diversiform, dizzy, doddering, doubtful, dubious, eccentric, erose, erratic, fast and loose, fickle, fitful, flickering, flickery, flicky, flighty, flitting, fluctuating, fluid, fluttering, fluttery, freakish, giddy, groggy, guttering, halting, hazardous, heeling, herky-jerky, heteroclite, ill-balanced, immethodical, impetuous, impulsive, inconsistent, inconstant, indecisive, infirm, insecure, insubstantial, intermittent, intermitting, irregular, irresolute, irresponsible, jagged, jerky, leaning, listing, lopsided, lurching, mazy, mercurial, mobile, moody, motley, moving, mutable, nonconformist, nonstandard, nonuniform, off-balance, overbalanced, patchy, perilous, pluralistic, precarious, protean, provisional, ragged, rambling, ramshackle, restless, ricketish, rickety, risky, rocky, rough, roving, scatterbrained, scrappy, shaky, shapeless, shifting, shifty, shuffling, slippery, snatchy, spasmatic, spasmic, spasmodic, spastic, spidery, spindly, spineless, spluttering, sporadic, spotty, sputtering, sputtery, staggering, teetering, teetery, temporary, tentative, ticklish, top-heavy, tottering, tottery, treacherous, tumbledown, unaccountable, unbalanced, uncertain, uncontrolled, undependable, undisciplined, unequable, unequal, uneven, unfaithworthy, unfixed, unhealthy, unmethodical, unmetrical, unorthodox, unpredictable, unregular, unreliable, unrestrained, unrhythmical, unsafe, unsettled, unsolid, unsound, unstable, unstable as water, unstaid, unsteadfast, unsubstantial, unsure, unsystematic, untrustworthy, ununiform, vacillating, vagrant, variable, variegated, variform, various, varying, veering, vicissitudinary, vicissitudinous, volatile, wandering, wanton, wavering, wavery, wavy, wayward, whimsical, wishy-washy, wobbling, wobbly