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 of illogical

• 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

Their complaints have been mostly incoherent and illogical, with UEFA's statement in particular being laughably inaccurate. — Ian Miller Outkick, FOXNews.com, 7 July 2026

In spite of D'Arcy's best efforts, Rhaenyra is an impenetrable character with illogical choices and zero magnetism to the viewers (or seemingly, her councilors). — Kelly Lawler, USA Today, 21 June 2026

On the outside, firing the coach of a first-place team seemed illogical. — Jason Lloyd, New York Times, 19 June 2026

He’s made his way into the backrooms and finds that the place keeps going, offering up illogical doorways and holes in the floor. — Alison Willmore, Vulture, 29 May 2026

Word History

First Known Use

1588, in the meaning defined at sense 1

Rhymes for illogical

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

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