Synonyms and related words :
abandoned, ad lib, at short notice, at sight, beyond control, breachy, by ear, contumacious, defiant, extemporaneously, extemporarily, extempore, fractious, go-go, immoderate, impromptu, incontinent, incorrigible, indocile, indomitable, indulgent, insuppressible, intemperate, intractable, irrepressible, lax, licentious, loose, nonrestrictive, obstreperous, off the cuff, off the hip, offhand, on sight, out of control, permissive, rampant, recalcitrant, refractory, reinless, resistant, resisting, restive, riotous, shrewish, unbiddable, unbridled, unchecked, uncoerced, uncompelled, unconstrained, uncontrollable, uncontrolled, uncurbed, unforced, ungovernable, ungoverned, uninhibited, unmalleable, unmanageable, unmastered, unmeasured, unmoldable, unmuzzled, unreined, unrepressed, unreserved, unrestrained, unrestrictive, unruly, unsubdued, unsubmissive, unsuppressed, wanton, wild