pathological

adjective

path·​o·​log·​i·​cal ˌpa-thə-ˈlä-ji-kəl 

variants or less commonly pathologic

ˌpa-thə-ˈlä-jik 

1

: of or relating to pathology

pathological research

A pathological examination led to the diagnosis.

2

: altered or caused by disease

pathological changes in the body

also : indicative of disease

pathological symptoms

3

: being such to a degree that is extreme, excessive, or markedly abnormal

a pathological liar

pathological fear

pathologically

ˌpa-thə-ˈlä-ji-k(ə-)lē 

adverb

Examples of pathological in a Sentence

He is a pathological liar.

She has a pathological fear of heights.

pathological changes in the body

Recent Examples on the Web

That’s when the loneliness becomes pathological. —Marta Balaga, Variety, 30 Jan. 2026

This should occur before, not after, a president’s pathological need and insecurity erupt into an unthinkable tragedy. —Reader Commentary, Baltimore Sun, 23 Jan. 2026

Known for weaving in multiple story arcs with a cadre of recurring characters coming and going, The Rookie had the first major return this season with Seth Ridley (Patrick Keleher), the pathological liar rookie introduced last season, back in tonight’s episode. —Nellie Andreeva, Deadline, 20 Jan. 2026

This work influenced how researchers understood chronic illness and disability and laid the groundwork for later debates on what counts as pathological or normal. —Jennifer Singh, The Conversation, 8 Jan. 2026

Word History

Etymology

New Latin pathologicus "of the study of the passions, of the study of diseases" (borrowed from Greek pathologikós, from patho- patho- + -logikos, from -logia -logy + -ikos -ic entry 1) + -al entry 1

First Known Use

1656, in the meaning defined at sense 1

Rhymes for pathological

• analogical
• astrological
• biological
• christological
• chronological
• cosmological
• cytological
• dialogical
• ecological
• ethnological
• ethological
• geological

Kids Definition

pathological

adjective

patho·​log·​i·​cal

ˌpath-ə-ˈläj-i-kəl

variants also pathologic

-ik

1

: of or relating to pathology

2

: changed or caused by disease

3

: being such to a degree that is extreme, excessive, or abnormal

a pathological liar

pathologically

-i-k(ə-)lē

adverb

Medical Definition

pathological

adjective

patho·​log·​i·​cal ˌpath-ə-ˈläj-i-kəl 

variants also pathologic

-ik 

1

: of or relating to pathology

a pathological laboratory

2

: altered or caused by disease

pathological tissue

also : indicative of disease

pathological lesions

pathologically

-i-k(ə-)lē 

adverb