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insubstantial (adj) not strong; not large; lacking substance (like a vision or a ghost).
An insubstantial thing is too small or too weak. It lacks a solid appearance. An insubstantial construction is a weak construction. An insubstantial argument is a weak argument. So is an insubstantial meal is a light meal which cannot satisfy hunger. Ghosts and visions are insubstantial; that is, they lack substance.
- Their arguments in support of their point were too insubstantial. They were not very convincing and appeared even silly.
- Rather too late in their lives, they realized that their dreams of commanding an empire were insubstantial, and that, in reality, there were many who were stronger than they and who they could not defeat.