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

In response, Cher’s lawyer argued that Mary’s position was illogical considering the court’s prior ruling protecting Cher’s rights. —Nancy Dillon, Rolling Stone, 18 Nov. 2024

Inspect the dates: False news stories often include illogical timelines or altered event dates. —Marley Malenfant, Austin American-Statesman, 24 Sep. 2024

Some states are in line with certain federal practices, and then some states are doing a bunch of incoherent, illogical things. —Andrew Paul, Popular Science, 23 Oct. 2024

While the lines have to go somewhere, these illogical divisions can confuse voters, Niven said. —Jessie Balmert, The Enquirer, 14 Oct. 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