different between noumenal vs unsubstantial

English

Equivalent to noumen(on) +? -al. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

noumenal (not comparable)

(philosophy, especially Kantianism) Of or pertaining to the noumenon or the realm of things as they are in themselves.
Antonym: phenomenal

From un- +? substantial.

unsubstantial (comparative more unsubstantial, superlative most unsubstantial)

(now rare) Insubstantial.
- 1751, Tobias Smollett, The Adventures of Peregrine Pickle, vol. III, ch. 89:
  “They are (said he) meer phantoms of ignorance and credulity, swelled up in the repetition, like those unsubstantial bubbles which the boys blow up in sopasuds with a tobacco pipe.”

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