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.

Primary Meanings of immaterial

1.
adj
(often followed by `to') lacking importance; not mattering one way or the other
2.
adj
without material form or substance
Full Definitions of immaterial
1

adj (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

adj of no importance or relevance especially to a law case

“an objection that is immaterial after the fact”
Antonyms:
material
directly relevant to a matter especially a law case
crucial
having crucial relevance
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adj 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
2

adj 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
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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adj 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
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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