; having no foundation in fact; fanciful; insubstantial: an unsubstantial argument; unsubstantial hopes.
without material substance: an unsubstantial ghost.
lacking material substance; materially paltry: an unsubstantial dinner of bread and cheese.
lacking strength or solidity; flimsy: an unsubstantial wall of cardboard.
is always a great word to know.
So is quincunx. Does it mean: