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Definitions

deep-sea

[deep-see] / ˈdipˈsi /

ADJECTIVE

marine

Synonyms

STRONGEST

aquatic coastal maritime naval saltwater seagoing

STRONG

littoral nautical oceanic sea seafaring seashore seaside shore

WEAK

Neptunian abyssal hydrographic natatorial navigational ocean-going oceanographic pelagic

Antonyms

WEAK

freshwater

ADJECTIVE

marine/maritime

Synonyms

WEAK

Neptunian abyssal aquatic coastal hydrographic littoral natatorial nautical naval navigational oceangoing oceanic oceanographic of the sea pelagic saltwater sea seafaring seagoing seashore seaside shore

ADJECTIVE

maritime

Synonyms

STRONGEST

aquatic marine naval oceangoing seafaring seagoing

WEAK

oceanic pelagic

ADJECTIVE

nautical

Synonyms

STRONGEST

maritime navigational seafaring

STRONG

marine

WEAK

abyssal aquatic boating cruising naval navigating oceangoing oceanic oceanographic pelagic rowing sailing sailorly salty sea-loving seagoing ship thalassic yachting

ADJECTIVE

nautical/naval

Synonyms

WEAK

abyssal aquatic boating cruising marine maritime navigating navigational oceangoing oceanic oceanographic pelagic rowing sailing sailorly salty sea-loving seafaring seagoing thalassic yachting

ADJECTIVE

thalassic

Synonyms

WEAK

Neptunian abyssal aquatic coastal hydrographic littoral maritime natatorial nautical naval navigational oceangoing oceanic oceanographic of the sea pelagic saltwater sea seafaring seagoing seashore seaside shore

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The animal was first spotted during a 2015 deep-sea expedition aboard the exploration vessel E/V Nautilus.

From Science Daily • May 25, 2026

The black box was found after months of deep-sea searches in 2011.

From BBC • May 21, 2026

About a decade ago, Japan discovered a large, deep-sea rare earth deposit that is considered the world’s third-largest high-quality, mineral-rich rare earth reserve.

From Barron's • May 20, 2026

Senior author Associate Professor Zoe Richards from Curtin's School of Molecular and Life Sciences said the technology could dramatically improve how scientists study and protect deep-sea ecosystems.

From Science Daily • May 14, 2026

Abbey and I hid nearby, on one of the deep-sea charter boats.

From "Flush" by Carl Hiaasen

deep-sea

Example Sentences

Related Words