insubstantial   (Sound)

The adj insubstantial has 2 senses

• insubstantial, unsubstantial, unreal -- (lacking material form or substance; unreal; "as insubstantial as a dream"; "an insubstantial mirage on the horizon")


• insubstantial, jejune -- (lacking in nutritive value; "the jejune diets of the very poor")