Synonyms of underpinning

underpinning 1 of 2

noun

ˈən-dər-ˌpi-niŋ 

1

as in basis

an immaterial thing upon which something else rests

the underpinnings of the theory have recently been called into question

Synonyms & Similar Words

• basis
• foundation
• bedrock
• cornerstone
• justification
• groundwork
• base
• root
• support
• framework
• premise
• ground
• core
• keystone
• theory
• footing
• warp
• essence
• infrastructure
• focus
• warp and woof
• bottom
• rationale
• assumption
• backbone
• thesis
• shore
• anchorage
• heart
• prop
• center
• substratum
• kernel
• warrant
• presumption
• bed
• mount
• substructure
• stay
• buttress
• brace
• presupposition
• bulwark
• supposition
• nucleus
• hub
• seat
• touchstone
• soul
• eye
• quintessence

2

as in support

a structure that holds up or serves as a foundation for something else

the underpinnings of the bridge were seriously damaged in the collision

Synonyms & Similar Words

• support
• reinforcement
• shore
• pillar
• foundation
• mounting
• brace
• prop
• mount
• spur
• stay
• buttress
• crutch
• shoring
• column
• truss
• arch
• bracket
• cantilever
• stand
• pedestal
• bolster
• frame
• stake
• bearing
• peg
• pilaster
• girder
• base
• strut
• post
• stilt
• stanchion

underpinning

2 of 2

verb

present participle of underpin

as in sustaining

to hold up or serve as a foundation for

the central beliefs that underpin a free society

Synonyms & Similar Words

• sustaining
• supporting
• carrying
• bolstering
• upholding
• staying
• undergirding
• buttressing
• bracing
• underlying
• bearing
• propping (up)
• shoring (up)
• steadying
• trussing

Example Sentences

Recent Examples of underpinning

Noun

The bishop, speaking with the Washington Examiner ahead of the address, called belief in the Christian God a fundamental underpinning of American civil society that guarantees minority faiths’ freedoms. — Timothy Nerozzi, The Washington Examiner, 17 May 2026

Earlier this year, the Environmental Protection Agency repealed its endangerment finding, which provides the legal underpinning for greenhouse gas regulations in the country. — Simmone Shah, Time, 30 Apr. 2026

Verb

One consequence of the equations underpinning that theory was the possibility of a singularity, a point at which the equations of general relativity go to infinity. — Robert Lea, Space.com, 16 July 2026

Attracting margin players With the artificial intelligence trade underpinning the latest multi-year bull run, it’s likely drawn a lot of margin players into the market, Opsal added. — Sean Conlon, CNBC, 15 July 2026