Synonyms for Immaterial:

adj.

airy (adjective)
breezy, atmospheric, climactic, vaporous, windy, airy.
extraneous (adjective)
separated, extraneous, alien, extrinsic, detached, unessential, external, inadmissible, inappropriate, parenthetical, foreign, irrelevant, segregated, nonessential, disconnected, impertinent, unaffiliated, outer, strange, disaffiliated, separate, extraterrestrial, foreign-born, dissociated, unrelated, eerie, exotic, disjoint, inapplicable, removed, other, outside, outlandish, estranged, Unallied.
immaterial (adjective)
imaginary, imponderable, unsubstantial, unearthly, conceptual, unworldly, intangible, abstract, impalpable, ethereal, bodiless, theoretical, supernatural, spiritual, eerie, incorporeal.
insubstantial (adjective)
incorporeal.
irrelevant (adjective)
inessential, unimportant, trivial, inappropriate, meaningless, inapplicable, impertinent, insignificant, foreign, unnecessary, extraneous.
metaphysical (adjective)
nonmaterial, nonphysical, Discarnate.
not existing in physical form (adjective)
impalpable, aerial, shadowy, spiritual, metaphysical, nonphysical, spectral, airy, bodiless, unsubstantial, imponderable, ghostly, incorporeal, Discarnate, intangible, unworldly, supernatural, unearthly, nonmaterial, apparitional, disembodied, ethereal, unembodied.
unsubstantial (adjective)
nonexistence, impalpable, unsubstantial, apparitional, ethereal, vacuous, unreal, vacant, weightless, intangible, unconcrete, inessential, phantasmal, null, empty, spectral, insignificance, tenuous, chimerical, illusory.

n.

neither here nor there, academic, beside the point, marginal. uncorporal, Discarnate, insubstantial, metaphysical, body. immaterial (noun)
incorporeal, indifferent, impertinent, unembodied, bodiless, nonphysical, irrelevant, spiritual, discorporate, nonmaterial, unbodied, disembodied, extraneous, unimportant, intangible.
inconsequential (noun)
unnecessary, insignificant, trivial, meaningless.

Other synonyms:

uncorporal, marginal, Discarnate, unbodied. insubstantial, metaphysical. academic. petty
trivial.

Usage examples for immaterial

  1. It would be perfectly immaterial to my importance how I influenced those votes, so long as I could control them. – The Honorable Peter Stirling and What People Thought of Him by Paul Leicester Ford
  2. Had we taken part in the creation of the world, we should probably have bestowed more special, distinctive force on all that is best in man, most immaterial most essentially human. – The Buried Temple by Maurice Maeterlinck
  3. How matter- the brain- can produce the immaterial the spiritual. – The Progressionists, and Angela. by Conrad von Bolanden