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

Analysts have suggested possible roles including intelligence, surveillance and reconnaissance, seabed monitoring, mine warfare and other long-range underwater missions. — Kaif Shaikh, Interesting Engineering, 17 Sep. 2026

As is the case with other underwater drones/small ROVs, the BentiX is connected to a communications cable that runs from it to a topside joystick remote control unit (wireless radio signals do not travel well through water). — New Atlas, 16 Sep. 2026

Traditionalists scoffed at the ‘plastic’ boats, but the Swan 36 featured a revolutionary underwater design. — Andrew Rice, New York Times, 15 Sep. 2026

With Bubble Treasure, her first album in English, Swedish songbird Toxe (pronounced tox-uh) brings breathy dream pop into a magical underwater realm. — Laird Borrelli-Persson, Vogue, 15 Sep. 2026