Synonyms of deep-sea

deep-sea

adjective

ˈdēp-ˈsē 

as in oceanic

of, relating to, or occurring in the open sea

chartered a boat to do some deep-sea fishing

Synonyms & Similar Words

• oceanic
• marine
• pelagic
• blue-water
• deepwater
• maritime
• nautical

Antonyms & Near Antonyms

• littoral

Example Sentences

Recent Examples of deep-sea

Trump urged Starmer to resume deep-sea drilling in the North Sea to ramp up gas and oil production in order to calm markets. — Claire Carter, The Washington Examiner, 21 June 2026

Its namesake ingredient—mineral-rich deep-sea water sourced near Korea's Dokdo region—is naturally packed with skin-balancing minerals like magnesium and calcium. — Christa Joanna Lee, Allure, 19 June 2026

The reversal comes after the agency’s May 21 announcement of its intent to remove hundreds of deep-sea buoys and sensors employed by the $368-million Ocean Observatories Initiative had drawn congressional and international backlash. — Dan Vergano, Scientific American, 18 June 2026

Host organisms may also depend on endosymbionts for fixing carbon and atmospheric nitrogen to survive under extreme conditions such as in deep-sea hydrothermal vents. — Encyclopedia Britannica, 18 June 2026