Definition: The word "unsubstantial" is an adjective that means something that lacks material form or substance. In simpler terms, it describes things that are not solid, real, or significant. For example, an idea can be unsubstantial if it is not based on facts or evidence.
In advanced contexts, "unsubstantial" can be used in academic writing to critique theories or ideas that are not well-supported. For instance, you might say, "The research presented an unsubstantial basis for the claims made about the effectiveness of the treatment."
While there are no common idioms or phrasal verbs that directly use "unsubstantial," you might encounter phrases like "a house of cards," which means something that is weak and likely to collapse, similar to the idea of being unsubstantial.
"Unsubstantial" is used to describe things that are not solid, real, or significant. It can apply to arguments, ideas, or even physical objects that lack strength or material form.