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

Consider Turkey, where the president’s unconventional, illogical view that lower interest rates would tame inflation has led to a yearslong price spiral and the collapse of the country’s currency. —Allison Morrow, CNN Money, 5 Sep. 2025

Sure, it's been criticized for what some call over-the-top clichés and illogical plot twists, but for some, at least, that's part of the fun. —EW.com, 31 Aug. 2025

Further, this assumes AI systems are actually free from the biases present in their training data, which is illogical. —Luis E. Romero, Forbes.com, 27 Aug. 2025

Officers making contact with Hyatt noted an odor of intoxicants, staggering gait, confusion and illogical, untruthful responses to questions, according to the motion. —Arkansas Online, 18 Aug. 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