Synonyms of underwater

underwater

adjective

ˌən-dər-ˈwȯ-tər 

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

• aquatic
• submarine
• submerged
• sunken
• oceanic
• undersea
• deep
• deepwater
• deep-sea
• abyssal
• abysmal

Example Sentences

Recent Examples of underwater

However, Microsoft ended the project in 2024 and chose not to build more underwater data centers. — Nir Kshetri, The Conversation, 17 Aug. 2026

The vessel supports the testing and deployment of robotic and autonomous, crewed and uncrewed underwater systems, and undersea surveillance systems, according to a press release. — Prabhat Ranjan Mishra, Interesting Engineering, 16 Aug. 2026

Downtown Redwood City’s newest Art Kiosk installation takes a look at what happens when an entire underwater ecosystem disappears where most people will never see it. — Anne Gelhaus, Mercury News, 16 Aug. 2026

For the past year, University of Washington researchers have worked closely with the Samish Indian Nation to bring this 24-armed creature back from the brink of extinction after a vast underwater pandemic nearly wiped it out. — John Ryan, NPR, 16 Aug. 2026