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
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Example Sentences
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Recent Examples of underwater
The robot’s ability to revisit the site, capture data, and retrieve objects with minimal disruption marks a shift toward non-invasive underwater archaeology.
—
Neetika Walter, Interesting Engineering, 30 Apr. 2026
The service is now developing plans for further underwater research and exploration, working with specialized teams in diving, robotics and autonomous systems.
—Anthony Thompson, USA Today, 30 Apr. 2026
The Coast Guard is now developing plans for underwater research and exploration.
—ABC News, 30 Apr. 2026
The soon-to-debut drone show, which will incorporate aerial formations and lighting effects, is meant to tell the story of marine life, highlighting underwater ecosystems.
—Lori Weisberg, San Diego Union-Tribune, 30 Apr. 2026
See All Example Sentences for underwater
Neetika Walter, Interesting Engineering, 30 Apr. 2026
The service is now developing plans for further underwater research and exploration, working with specialized teams in diving, robotics and autonomous systems.
—Anthony Thompson, USA Today, 30 Apr. 2026
The Coast Guard is now developing plans for underwater research and exploration.
—ABC News, 30 Apr. 2026
The soon-to-debut drone show, which will incorporate aerial formations and lighting effects, is meant to tell the story of marine life, highlighting underwater ecosystems.
—Lori Weisberg, San Diego Union-Tribune, 30 Apr. 2026
See All Example Sentences for underwater
Recent Examples of Synonyms for underwater
Adjective
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The Seminoles held off West Orange 8-4 in Saturday’s final at the Belen school’s aquatic center in Miami.—
Steve Gorches,
The Orlando Sentinel,
25 Apr. 2026
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These massive mollusks may even have eaten large aquatic reptiles like mosasaurs and plesiosaurs, which were themselves believed to be among the main marine predators of the time.—
Adam England,
PEOPLE,
24 Apr. 2026
Adjective
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One of the major functions of modern navies is submarine hunting.—
New Atlas,
New Atlas,
18 Jan. 2026
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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.—
Lisa Hagen,
Hartford Courant,
6 Aug. 2025
Adjective
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Los Angeles firefighters pulled Andrade’s teenage son from the lake first, but struggled to locate the father, who remained submerged.—
Anthony Thompson,
USA Today,
28 Apr. 2026
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Scientists with the Environmental Defense Fund said in a 2019 study that hydropower plants and reservoirs can emit substantial greenhouse gases, but their depth and design, the amount of submerged vegetation, and local climate influence how much.—
Ian James,
Los Angeles Times,
15 Apr. 2026
Cite this Entry
“Underwater.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underwater. Accessed 2 May. 2026.
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