inexhaustible

adjective

in·​ex·​haust·​ible ˌi-nig-ˈzȯ-stə-bəl 

: not exhaustible: such as

a

: incapable of being used up

inexhaustible riches

b

: incapable of being wearied or worn out

an inexhaustible hiker

inexhaustibility

ˌi-nig-ˌzȯ-stə-ˈbi-lə-tē 

noun

inexhaustibleness

ˌi-nig-ˈzȯ-stə-bəl-nəs 

noun

inexhaustibly

ˌi-nig-ˈzȯ-stə-blē 

adverb

Synonyms of inexhaustible

• meticulous
• indefatigable
• unflagging
• relentless
• untiring
• tireless
• active
• vigorous
• energetic
• conscientious
• intense
• diligent

Examples of inexhaustible in a Sentence

The world's supply of oil is not inexhaustible.

He seems to have inexhaustible energy.

Recent Examples on the Web

That incomparable vision was fueled by an inexhaustible optimism. —James Hibberd, HollywoodReporter, 23 Mar. 2026

Domestically written, produced, and performed films and series felt inexhaustible and were widely popular. —Lily Moayeri, Rolling Stone, 3 Mar. 2026

Such a wellspring of material is seemingly inexhaustible, though the show strains a bit when working to match the festival shooting as a crucible that pushes its cast to the breaking point. —Alison Herman, Variety, 5 Jan. 2026

Beyond its thriving market, Spain remains an inexhaustible creative force. —Leila Cobo, Billboard, 15 Dec. 2025

Word History

First Known Use

1601, in the meaning defined above

Rhymes for inexhaustible

• exhaustible

Kids Definition

inexhaustible

adjective

in·​ex·​haust·​ible ˌin-ig-ˈzȯ-stə-bəl 

1

: impossible to use up

an inexhaustible supply

2

: impossible to tire out

an inexhaustible worker

inexhaustibility

-ˌzȯ-stə-ˈbil-ət-ē 

noun

inexhaustibly

-ˈzȯ-stə-blē 

adverb