immaterial

Things that are immaterial have no physical form (like a ghost) or are unimportant (like most ghost stories).

Something that’s material has substance, right? You can touch it or it's important. So the opposite is the word immaterial, which means something that doesn't matter, or has no physical substance, or which adds nothing to the subject at hand. This word is heard a lot in court, where "It's immaterial!" dismisses evidence or testimony as meaningless or beside the point. You could say the wind is literally immaterial, though windiness is not immaterial if you’re going kiting.

Definitions of immaterial
  1. adjective
    (often followed by `to') lacking importance; not mattering one way or the other
    “whether you choose to do it or not is a matter that is quite immaterial (or indifferent)”
    synonyms: indifferent
    unimportant
    not important
  2. adjective
    of no importance or relevance especially to a law case
    “an objection that is immaterial after the fact”
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    Antonyms:
    material
    directly relevant to a matter especially a law case
    crucial
    having crucial relevance
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  3. adjective
    not pertinent to the matter under consideration
    “the price was immaterial
    synonyms: extraneous, impertinent, orthogonal
    irrelevant
    having no bearing on or connection with the subject at issue
  4. adjective
    without material form or substance
    synonyms: incorporeal
    unbodied
    having no body
    bodiless, discorporate, disembodied, unbodied, unembodied
    not having a material body
    spiritual
    lacking material body or form or substance
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    Antonyms:
    corporeal, material
    having material or physical form or substance
    bodied
    having a body or a body of a specified kind; often used in combination
    bodily
    having or relating to a physical material body
    bodied, corporal, corporate, embodied, incarnate
    possessing or existing in bodily form
    reincarnate
    having a new body
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  5. adjective
    not consisting of matter
    immaterial apparitions”
    “ghosts and other immaterial entities”
    synonyms: nonmaterial
    insubstantial, unreal, unsubstantial
    lacking material form or substance; unreal
    intangible, nonphysical
    lacking substance or reality; incapable of being touched or seen
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    Antonyms:
    material
    derived from or composed of matter
    material, real, substantial
    having substance or capable of being treated as fact; not imaginary
    physical
    having substance or material existence; perceptible to the senses
    physical
    concerned with material things
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Word Family