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

• unreasonable
• irrational
• unreasoning
• illegitimate

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

The android, played by Alexander Skarsgård, is often fed up with humans and their illogical, self-defeating choices. —Omar L. Gallaga, Los Angeles Times, 11 July 2025

As presented in the Gang's illogical scapegoating, fearmongering, and overall manipulative self-exoneration, the debate turned into a farce. —Dennis Perkins, EW.com, 10 July 2025

All of which is to say, this rebound isn't totally illogical. —Kelly Evans, CNBC, 25 June 2025

This is not a regime worth defending, and recent progressive attempts to link the situation in Iran with the war in Iraq, ostensibly fought over weapons of mass destruction that did not prove to exist at scale, are illogical. —The Editorial Board, Chicago Tribune, 22 June 2025

Word History

First Known Use

1588, in the meaning defined at sense 1

Rhymes for illogical

• zoological
• aetiological
• anthropological
• archaeological
• axiological
• climatological
• deontological
• dermatological
• eschatological
• etiological
• etymological
• gerontological

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