incapable

adjective

in·​ca·​pa·​ble (ˌ)in-ˈkā-pə-bəl 

1

: lacking capacity, ability, or qualification for the purpose or end in view: such as

a

: not able or fit for the doing or performance : incompetent

b

: not being in a state or of a kind to admit : insusceptible

c

archaic : not able to take in, hold, or keep

d

archaic : not receptive

2

: lacking legal qualification or power (as by reason of mental incompetence) : disqualified

incapability

(ˌ)in-ˌkā-pə-ˈbi-lə-tē 

noun

incapableness

(ˌ)in-ˈkā-pə-bəl-nəs 

noun

incapably

(ˌ)in-ˈkā-pə-blē 

adverb

Synonyms

• unfit
• incompetent
• unfitted
• unable

Examples of incapable in a Sentence

hired a supremely incapable assistant who only made a mess of things

Recent Examples on the Web

An advance healthcare directive wouldn’t take effect unless your adult child were incapable of making decisions on their own. —Daniel De Visé, USA Today, 30 July 2025

The value of a public office not to be sold, is incapable of being ascertained; and the applicant has a right to the office itself, or to nothing. —Liz Tracey, JSTOR Daily, 29 July 2025

This definition also includes instance in which the victim is incapable of giving consent because of temporary or permanent mental or physical incapacity (include due to the influence of drugs or alcohol) or because of age. —Baltimore Sun Staff, Baltimore Sun, 28 July 2025

The Rams might have drafted Terrance Ferguson for his receiving ability, but there was a time back in middle school when the rookie tight end was incapable of catching a football. —Adam Grosbard, Oc Register, 28 July 2025

Word History

Etymology

Middle French, from in- + capable capable

First Known Use

1594, in the meaning defined at sense 1

Rhymes for incapable

• capable
• inescapable

Kids Definition

incapable

adjective

in·​ca·​pa·​ble (ˈ)in-ˈkā-pə-bəl 

: not able to do something

incapable of cleaning her room thoroughly

incapability

(ˌ)in-ˌkā-pə-ˈbil-ət-ē 

noun

Legal Definition

incapable

adjective

in·​ca·​pa·​ble

: lacking legal qualification or power (as by reason of mental incompetence) see also incapacity