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
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Example Sentences
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Recent Examples of underwater
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
Directed by Jérémie Hoarau (Lastman), the near-future set story follows Ina and Claude, commercial divers who join the crew of an underwater station located 200 meters below the ocean’s surface.
—
Melanie Goodfellow,
Deadline,
24 June 2026
Police said the child went underwater along the east side of the catwalk and just south of the lighthouse.
—
Gina Kalsi,
PEOPLE,
23 June 2026
See All Example Sentences for underwater
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
Directed by Jérémie Hoarau (Lastman), the near-future set story follows Ina and Claude, commercial divers who join the crew of an underwater station located 200 meters below the ocean’s surface.
—
Melanie Goodfellow,
Deadline,
24 June 2026
Police said the child went underwater along the east side of the catwalk and just south of the lighthouse.
—
Gina Kalsi,
PEOPLE,
23 June 2026
See All Example Sentences for underwater
Recent Examples of Synonyms for underwater
Adjective
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Most aquatic animals swim but some also walk (crabs), jump (like a squirting scallop), and crawl (starfish, sea cucumbers).
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While often a nuisance, especially toxic cyanobacteria, algae are vital for aquatic ecosystems, producing oxygen and forming the food web's base.
Adjective
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But a new antenna technology, borrowed from the physics of medical implants, is rethinking how submarine machines talk to each other – and to us.
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Last December, lawmakers passed a short-term funding bill that included $5.7 billion in emergency funding for the submarine industrial base.
Adjective
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The driver was found deceased inside her submerged vehicle hours after calling 911 for help.
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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 28 Jun. 2026.
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