adjective
Having no matter or substance; incorporeal.
Of the nature of the soul or spirit; spiritual.
Of no importance; inconsequential, insignificant, unimportant.
Having or seeming to have very little substance; insubstantial, slight.
Especially of evidence; chiefly followed by to: not associated in any way that is important or useful to the context being discussed; irrelevant.
noun
(countable, chiefly in the plural) A being or entity having no matter or substance.
(countable, chiefly in the plural) A thing which is abstract or intangible; (uncountable) chiefly preceded by the: things which are abstract or intangible considered collectively.