immaterial

Short definition from Wiktionary

Adjective

1. 1
   Having no matter or substance; incorporeal.
2. 2
   Of the nature of the soul or spirit; spiritual.
3. 3
   Of no importance; inconsequential, insignificant, unimportant.
4. 4
   Having or seeming to have very little substance; insubstantial, slight.
5. 5
   Especially of evidence; chiefly followed by to: not associated in any way that is important or useful to the context being discussed; irrelevant.

Noun

1. 1
   A being or entity having no matter or substance.
2. 2
   A thing which is abstract or intangible; (uncountable) chiefly preceded by the: things which are abstract or intangible considered collectively.