Definition

Not based on clear reasoning or sound judgment; lacking logical sense.

Example

His argument was illogical and hard to follow.

Conversation

Did you hear her new theory about how the moon affects our mood?

Yeah, I thought it was a bit illogical myself.

Exactly! I mean, there's no real evidence to support that.

Right? Sometimes people just say things that don't make sense.

Synonyms & Antonyms

Root Explanation

Illogical → It is formed from "il-" (meaning not) and "logikos" (from Greek, meaning reasoned or logical). The word "illogical" means not logical or lacking reason.

Memory Tip

Think of 'not' ('il-') combined with 'reasoned' ('logikos') to remember that 'illogical' means something that does not make sense.

Visually Confused Words