Learn how to say Insubstantial correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word insubstantial:
lacking strength and solidity:
the huts are relatively few and insubstantial
not having physical existence:
the flickering light made her face seem insubstantial
early 17th century: from late Latin insubstantialis, from in- ‘not’ + substantialis (see substantial)