From Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "possible":
accomplishable, achievable, admissible, advisable, algorismic,
algorithmic, aliquot, attainable, available, between the lines,
cardinal, cogitable, conceivable, conceivably possible, contingent,
covert, credible, cryptic, decimal, delitescent, differential,
digital, doable, dormant, earthly, esoteric, even, expedient,
exponential, feasible, figural, figurate, figurative, finite,
fractional, hibernating, hidden, humanly possible, imaginable,
imaginary, impair, impossible, infinite, integral, irrational,
latent, likely, logarithmic, logometric, lurking, mortal, muffled,
mystic, negative, numeral, numerary, numerative, numeric,
obfuscated, obscured, occult, odd, on, ordinal, pair, plausible,
positive, potential, practicable, practical, prime, probable,
radical, rational, reachable, real, realizable, reasonable,
reciprocal, sleeping, submerged, submultiple, surd, tenable,
thinkable, transcendental, under the surface, underlying,
unmanifested, veiled, viable, virtual, workable

 

 

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