doable, impossible, unfeasible, accomplishable, unrealistic, infeasible, feasible, unworkable, unachievable, achievable, impractical, unmanageable, difficult, illogical, uneconomical, incomprehensible, onerous, daunting, insane, inconceivable, prohibitive, ridiculous, unwieldy, unsupportable, unaffordable, conquerable, unavoidable, unwise, unreal, insurmountable, uneconomic, irrelevant, arbitrary, unsustainable, unattainable, absurd, unreasonable, overambitious, counterproductive, unthinkable, implausible, attainable, unviable, fundable, problematic, complicated, solvable, unimportant, ambitious, pointless, useless, ludicrous, unfathomable, inflexible, cumbersome, nonsensical, laughable, meaningless, untenable, easy, unpractical, inconvenient, hopeless, untouchable, irrational, irresolvable, preposterous, indefensible, burdensome, insuperable, unnavigable, workable, incoherent, wrong, asinine, unreachable, challenging, fixable, unnecessary, obsolete, futile, manageable, challengeable, costless, understandable, unthought, quixotic, comprehensible, insolvable, unfocused, unaccomplished, inefficient, uninteresting, counterintuitive, unobtainable, duplicative, unacceptable, thinkable, unconstitutional, unsexy, realistic, superfluous, commit, breaking, delete, editing, refresh, save, ulterior, unobserved, unspectacular, concurrent, consummatory, disable, disconnected, edit, effortful, executable, expansionary, foreground, intended, invoked

impossible, unachievable, unattainable, unrealizable