Main entry: insubstantial, unreal, unsubstantial
Definition: lacking material form or substance; unreal
Usage: as insubstantial as a dream; an insubstantial mirage on the horizon
Antonyms: real, material, substantial
Definition: having substance or capable of being treated as fact; not imaginary
Main entry: jejune, insubstantial
Definition: lacking in nutritive value
Usage: the jejune diets of the very poor
Antonyms: wholesome
Definition: conducive to or characteristic of physical or moral well-being