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

Everything from The Overlook’s illogical architecture to the backstories of the mysterious unnamed ghosts inhabiting it has been studied across multiple documentaries. —Wilson Chapman, IndieWire, 17 Sep. 2024

There's an odd twist in the Arkansas Razorbacks' nonconference results for the last couple of decades that is largely illogical. —Tom Murphy, arkansasonline.com, 7 Sep. 2024

An immediate first step is to stop the illogical closure of existing nuclear plants and press ahead with new ones of traditional design. —Armond Cohen, Foreign Affairs, 3 Nov. 2021

That’s not entirely illogical, given that the S&P 600 small cap index is trading at just 13.9 times forward earnings, while the large cap S&P 500 index is trading at over 21 times forward earnings. —Will Daniel, Fortune, 11 July 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