Synonyms of underbelly

underbelly

noun

ˈən-dər-ˌbe-lē 

1

as in underworld

a social sphere that exists outside of the mainstream

unable to get work in mainstream films, the actor ended up in Hollywood's underbelly—the porn industry

Synonyms & Similar Words

• underworld
• abyss
• netherworld
• depths
• demimonde
• half-world
• demiworld

2

as in underside

the side or part facing downward from something

the underbelly of the old submarine is in bad shape

Synonyms & Similar Words

• underside
• bottom
• undersurface
• underbody
• seat
• floor
• underpart
• belly
• foot
• toe
• sole
• base
• underpinning
• ground
• undercarriage

Antonyms & Near Antonyms

• top
• face
• apex
• roof
• peak
• crest
• height
• pinnacle
• crown
• summit
• meridian
• climax
• culmination
• head
• point
• tip
• zenith
• high-water mark
• cusp
• acme
• tip-top

3

as in back

a vulnerable point

the vast, thinly guarded southern border was obviously the underbelly of the nation's line of defense

Synonyms & Similar Words

• back
• soft spot
• jugular
• downfall
• chink
• Achilles' heel
• undoing
• ruin
• tragic flaw
• hamartia

Example Sentences

Recent Examples of underbelly

But the Stones’ undying love of blues shines through in 18 songs that revel in the seamy underbelly of America. — René Ostberg, Encyclopedia Britannica, 8 July 2026

Reporters expose an underbelly of developments that affect lives and livelihoods. — Gypsy Guillén Kaiser, Fortune, 23 June 2026

The new aircraft eschews the Kennedy-era robin's-egg blue exterior of the old plane for a bolder look, with the underbelly of the plane painted navy blue with a red stripe above it. — Arkansas Online, 20 June 2026

Afterwards, in the stadium’s underbelly, Kaka, Rivaldo and Bebeto mingled with fans. — James Horncastle, New York Times, 20 June 2026