unsubstantial

adj

1. (archaic)Insubstantial.

   “What boots it, that my Fortune decks me thus / With unſubſtantial Plumes; when my Heart groans / Beneath the gay Capariſon, and Love / With unrequited Paſſion wounds my Soul!”

   “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.”

   “They shook hands upon it, and Sydney turned away. Within a minute afterward he was, to all outward appearance, as unsubstantial as ever.”

   “Psychoanalysis, the modern science of reading dreams, has taught us to take heed of these unsubstantial images.”