Definition

Having beliefs or ideas that are not based in reality, often despite evidence to the contrary.

Example

He was delusional, thinking he could fly without any help.

Conversation

I can't believe he actually thinks he's going to win that contest.

Right? It's a bit delusional if you ask me.

I mean, he hasn’t even practiced at all!

Exactly! You can't just expect to win by dreaming.

Synonyms & Antonyms

Root Explanation

Delusional → It is formed from "deludere" (meaning to deceive) and the suffix "-al" (meaning pertaining to). The word "delusional" refers to a state pertaining to being deceived or having false beliefs.

Memory Tip

Think of being in a state of being 'deceived' ('deludere') — that's why delusional means having false beliefs.

Visually Confused Words