illogical

adjective

il·​log·​i·​cal (ˌ)i(l)-ˈlä-ji-kəl 

1

: not observing the principles of logic

an illogical argument

2

: devoid of logic : senseless

illogical policies

illogicality

(ˌ)i(l)-ˌlä-jə-ˈka-lə-tē 

noun

illogically

(ˌ)i(l)-ˈlä-ji-k(ə-)lē 

adverb

illogicalness

(ˌ)i(l)-ˈlä-ji-kəl-nəs 

noun

Synonyms

• fallacious
• illegitimate
• inconsequent
• inconsequential
• invalid
• irrational
• nonrational
• unreasonable
• unreasoning
• unsound
• weak

Examples of illogical in a Sentence

It is illogical to think that things will change on their own.

the illogical claim that playing basketball makes people taller because one sees so many tall players

Recent Examples on the Web

Honolulu’s case is illogical on its face given that its allegations of damages stem from interstate greenhouse gas emissions. —David Blackmon, Forbes, 30 Dec. 2024

What’s hard about this, of course, is that fear is often illogical, and our wants can be, too. —R. Eric Thomas, The Mercury News, 28 Dec. 2024

Curiosity In The Billable Hour World In a world where every minute counts, taking what may feel like the long way around can seem illogical. —Hunter McMahon, Forbes, 4 Dec. 2024

This is a holiday movie, so Avery and Logan decide to handle this situation in the most illogical way possible. —Stephanie McNeal, Glamour, 27 Nov. 2024

Word History

First Known Use

1588, in the meaning defined at sense 1

Kids Definition

illogical

adjective

il·​log·​i·​cal (ˈ)il-ˈ(l)äj-i-kəl 

: not using or following good reasoning

illogically

-i-k(ə-)lē 

adverb