Definition

Not having a solid or strong basis; weak or flimsy.

Example

The argument he presented was unsubstantial and did not convince anyone.

Conversation

I read that report on the new project, but it seemed kind of unsubstantial to me.

Yeah, I noticed that too; there weren't any solid facts to back it up.

It's frustrating because we need reliable information to move forward.

Totally agree! Without strong evidence, it's hard to take it seriously.

Synonyms & Antonyms

Root Explanation

Unsubstantial → It is formed from "un-" (meaning not) and "substantialis" (from Latin, meaning having substance or being real). The word "unsubstantial" means not having substance or being insubstantial.

Memory Tip

Think of 'not' ('un-') having 'substance' ('substantialis') — that's why unsubstantial means lacking real substance.

Visually Confused Words