possibility, possibleness

unlikelihood, improbability, necessity, inevitability, absurdity, difficulty, unlikeliness, impracticality, impracticability, folly, prerequisite, incongruity, fallacy, uselessness, implausibility, futility, imaginary, infeasibility, inadvisability, pointlessness, tautology, obsession, arduousness, finiteness, endlessness, undoable, impediment, illogicality, bizarreness, imminence, fait accompli, essentialness, imperfection, irrelevance, quiddity, nightmare, disproof, obstacle, irreversibility, dailiness, foregone conclusion, dubiousness, vagary, uninterest, preoccupation, falseness, unimportance, contradiction, immaculate conception, joylessness, incommensurability, determinist, inadequacy, irreconcilability, absolute, immensity, incapacity, pipedream, idealisation, limitlessness, inexistence, oddity, banality, ghastliness, rightfulness, simultaneity, percipient, immovability, factuality, rightness, paradox, illusion, disinterest, superfluity, repulsiveness, finitude, nebulousness, sophistries, absurdness, probability, precariousness, circularity, verge, sine qua non, perplexity, meaninglessness, centrality, surplusage, certainty, occupational hazard, dreadfulness, incomprehensibility, incompleteness, doddle, incredibility, indispensability, fallibility, marginality, abomination, imposture, unnaturalness, intellectualization, inability, soundness, falsity, impossibilities, reasonableness, unfitness, incoherence, ineffectiveness, impotency, invalidity

impossible, inconceivability, inconceivableness, unattainableness

modality, mode

alternative, choice, nonexistence, option

impossible action, impossibleness