possible

difficult, inconceivable, unfeasible, undoable, easy, impractical, harder, incomprehensible, unable, unlikely, imperative, feasible, implausible, unwise, unbearable, irrelevant, necessary, problematic, unavoidable, unrealistic, unfathomable, untenable, conceivable, trickier, plausible, infeasible, unthinkable, doable, unachievable, absurd, unattainable, futile, prohibitive, unreal, useless, tempting, daunting, unobtainable, unmanageable, advisable, inadvisable, pointless, unimaginable, meaningless, foolhardy, unviable, laughable, ludicrous, unworkable, insuperable, inevitable, unheard, intolerable, impenetrable, ridiculous, inconvenient, uneconomical, complicated, easer, unreachable, improbable, impassable, illogical, preposterous, unreasonable, frustrating, able, unusable, inaccessible, axiomatic, unbelievable, foregone conclusion, hopeless, arduous, nonexistent, counterproductive, worthwhile, effortless, unadvisable, instantaneous, maddening, essential, irresistible, problematical, doubtful, understandable, foolish, preferable, unconceivable, insurmountable, indispensable, illusive, acceptable, indistinguishable, unknowable, impassible, insane, unrecognizable, exhausting, uncommon, enough, indecipherable, ...., bodily, fixity, hoss, nobody, things, thrice, achilles, afore, afresh, alibi, alone, antinomy, antithesis, ascetic, assurance, avatar, bargain, beforehand, blankness, unrealizable, ideal, tough, impracticable, happy, perplexing, strange, ticklish

., allegiant, box, circumscribed, close out, corner, crash landing, cy pres, cy pres doctrine, delimited, dogging, exhausted, fibrous, hostile, immeasurable, immensurable, impassable, impenetrable, imperceptible, implacable, imponderable, impossibly, impregnable, inaudible, incommensurable, incomparable, incompressible, inconceivability, inconceivableness, incontrovertible, inconvertibility, incurable, incurably, indecipherable, indeterminacy principle, indiscernible, indisputable, indivisible, indomitability, indomitable, ineluctability, ineluctable, inescapable, inexpugnable, inextinguishable, infrangible, insatiable, insatiate, inscrutability, insuperable, insurmountable, intolerable, introuvable, invincibility, invisible, irreconcilable, irrefutable, irremediable, irremovable, irreparable, irreplaceable, irrepressible, irreproducible, irresistibility, irresistible, irresistibleness, irretrievable, irreversible, irrevocable, irrevokable, kill, ladies' slipper, lady's slipper, lady-slipper, lysine intolerance, mathematically, nescient, never-say-die, no-go area, no-win situation, nonflammable, obviatinga, penal colony, perpetual motion, perpetual motion machine, physically, positive, preclude, preclusive, quenchless, relativistically, resistless, rule of cy pres, rule out, sinewy, slipper orchid, statistically, stringy, sure, technologically, thermodynamically, transmutation, unachievable, unanswerable, unassailable, unattainable, unavoidability, unavoidable, unbearable, unbelieving, unbreakable, uncertainty principle, unchewable, unclimbable, uncomparable, uncontrollable, undoable, unendurable, unfathomable, unforgettable, unhearable, unidentifiable, unlikable, unlikeable, unmalleable, unmeasurable, unnavigable, unpassable, unperceivable, unpredictable, unpronounceable, unquenchable, unquestionable, unrealizable, unreconcilable, unreplaceable, unreproducible, unretrievable, unsalable, unsaleable, unsatiable, unsatisfiable, unseeable, unserviceable, unsubduable, unsurmountable, untouchable, untraversable, unusable, unuseable

impossibility, impossible action

insufferable, out, out of the question, unacceptable, unsufferable