Impossible to measure or compare in value or size or excellence.

Roget 15: differing etc. v.; different, diverse, heterogeneous, multifarious, polyglot; distinguishable, dissimilar; varied, modified; diversified, various, divers, all manner of, all kinds of; variform etc. 81; daedal^†.    other, another, not the same; unequal etc. 28.    unmatched; widely apart, poles apart, distinctive; characteristic, discriminative, distinguishing.    incommensurable, incommensurate.    ... show more

Roget 10: irrelative^†, irrespective, unrelated; arbitrary; independent, unallied; unconnected, disconnected; adrift, isolated, insular; extraneous, strange, alien, foreign, outlandish, exotic.    not comparable, incommensurable, heterogeneous; unconformable etc. 83.    irrelevant, inapplicable; not pertinent, not to the, purpose; impertinent, inapposite, beside the mark, a propos de bottes [Fr.]; aside from the purpose, away from the purpose, foreign to the purpose, beside the purpose, beside the question, beside the transaction, beside the point; misplaced etc. (intrusive) 24; traveling out of the record.    remote, far-fetched, out of the way, forced, neither here nor there, quite another thing; detached, segregate; disquiparant^†.    multifarious; discordant etc. 24.    incidental, parenthetical, obiter dicta, episodic.    ... show more

Roget 84: numeral, complementary, divisible, aliquot, reciprocal, prime, relatively prime, fractional, decimal, figurate^†, incommensurable.    proportional, exponential, logarithmic, logometric^†, differential, fluxional^†, integral, totitive^†.    positive, negative; rational, irrational; surd, radical, real; complex, imaginary; finite; infinite; impossible.    ... show more

Roget 85: numeral, numerical; arithmetical, analytic, algebraic, statistical, numerable, computable, calculable; commensurable, commensurate; incommensurable, incommensurate, innumerable, unfathomable, infinite.    ... show more

Roget 464a: incommensurable, incommensurate; incomparable; different etc. 15.   

Roget 24: disagreeing etc. v.; discordant, discrepant; at variance, at war; hostile, antagonistic, repugnant, incompatible, irreconcilable, inconsistent with; unconformable, exceptional etc. 83; intrusive, incongruous; disproportionate, disproportionated^†; inharmonious, unharmonious^†; inconsonant, unconsonant^†; divergent, repugnant to.    inapt, unapt, inappropriate, improper; unsuited, unsuitable; inapplicable, not to the point; unfit, unfitting, unbefitting; unbecoming; illtimed, unseasonable, mal a propos [Fr.], inadmissible; inapposite etc. (irrelevant) 10.    uncongenial; ill-assorted, ill-sorted; mismatched, misjoined^†, misplaced, misclassified; unaccommodating, irreducible, incommensurable, uncommensurable^†; unsympathetic.    out of character, out of keeping, out of proportion, out of joint, out of tune, out of place, out of season, out of its element; at odds with, at variance with.    ... show more

Not having a common factor.