seismic

[sahyz-mik, sahys-] / ˈsaɪz mɪk, ˈsaɪs- /

ADJECTIVE

pertaining to an earthquake or event within the earth's crust

Synonyms

STRONGEST

basaltic tectonic

STRONG

quaky quivering tremorous tremulous vibrational

WEAK

earthshattering groundbreaking profound tumultuous

Antonyms

STRONGEST

ethereal insubstantial subtle vaporous

STRONG

constant fixed motionless placid solid unchanging

WEAK

frivolous inconsequential insignificant superficial trivial

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Govan acknowledged that below-grade costs were quite large because they went toward 56 seismic base isolators, which can move 5 feet in any direction in the event of an earthquake.

From Los Angeles Times • Apr. 8, 2026

Goodspeed travels back to the 18th century to downturns in the U.S. and the United Kingdom to explain why the common narrative that one seismic shock will flip an economy on its head is wrong.

From Barron's • Apr. 3, 2026

Woods’s contributions to the game of golf are seismic, but he doesn’t need to be reminded of that for a while.

From The Wall Street Journal • Mar. 29, 2026

The Premier League's chaos clubs meet on Sunday as Tottenham Hotspur host Nottingham Forest in what could be a seismic moment in the survival battle.

From BBC • Mar. 21, 2026

Even though everything he said was complimentary, his voice registered like a seismic shock down everyone’s spine.

From "Scythe" by Neal Shusterman