as in aquatic
living, lying, or occurring below the surface of the water
underwater plants don't require as much light to grow as surface plants a vessel designed for underwater exploration
Synonyms & Similar Words
Relevance
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of underwater
One went underwater and did not resurface.
—
Doug Myers,
CBS News,
27 June 2026
Bocas is blessed with more than a dozen excellent dive sites including underwater caves and pinnacles, reef walls, drift dive locations, and wrecks like the Barco Viejo and Mystic Wind.
—
Joe Yogerst,
Forbes.com,
25 June 2026
The 10,000 mAh battery is rated to last for a full five hours of underwater cleaning time, and that's more than enough for most backyard pools up to 3,200 square feet.
—
K. Thor Jensen,
PC Magazine,
25 June 2026
From Key Largo to Key West, the Overseas Highway strings the islands together like beads, running past lighthouses, underwater coral reef parks, and across the postcard-worthy Seven Mile Bridge.
—
Sarah Rose,
Travel + Leisure,
25 June 2026
See All Example Sentences for underwater
Doug Myers,
CBS News,
27 June 2026
Bocas is blessed with more than a dozen excellent dive sites including underwater caves and pinnacles, reef walls, drift dive locations, and wrecks like the Barco Viejo and Mystic Wind.
—
Joe Yogerst,
Forbes.com,
25 June 2026
The 10,000 mAh battery is rated to last for a full five hours of underwater cleaning time, and that's more than enough for most backyard pools up to 3,200 square feet.
—
K. Thor Jensen,
PC Magazine,
25 June 2026
From Key Largo to Key West, the Overseas Highway strings the islands together like beads, running past lighthouses, underwater coral reef parks, and across the postcard-worthy Seven Mile Bridge.
—
Sarah Rose,
Travel + Leisure,
25 June 2026
See All Example Sentences for underwater
Recent Examples of Synonyms for underwater
Adjective
-
Most aquatic animals swim but some also walk (crabs), jump (like a squirting scallop), and crawl (starfish, sea cucumbers).
-
While often a nuisance, especially toxic cyanobacteria, algae are vital for aquatic ecosystems, producing oxygen and forming the food web's base.
Adjective
-
But a new antenna technology, borrowed from the physics of medical implants, is rethinking how submarine machines talk to each other – and to us.
-
As a near-term step, the United States, Australia, and the United Kingdom should invite Japan to participate in discrete (non-submarine) elements of the 2021 AUKUS security pact, which will support Australia’s acquisition of nuclear submarines and promote cooperation on other advanced capabilities.
Adjective
-
The driver was found deceased inside her submerged vehicle hours after calling 911 for help.
-
This seemingly futuristic idea drew on his Navy experience with water-splitting electrolyzers, which supplied the oxygen that enabled subs to remain submerged for months at a time, and NASA’s use of hydrogen fuel cells to power the Apollo missions.
Cite this Entry
“Underwater.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underwater. Accessed 2 Jul. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
