UNDERWATER
subaqueous, subaquatic, submerged, submersed, underwater
(adjective) growing or remaining under water; “viewing subaqueous fauna from a glass-bottomed boat”; “submerged leaves”
submerged, submersed, underwater
(adjective) beneath the surface of the water; “submerged rocks”
Source: WordNet® 3.1
Etymology
Adjective
underwater (comparative more underwater, superlative most underwater)
(not comparable) beneath the surface of the water, or of or pertaining to the region beneath the water surface
(nautical) beneath the water line of a vessel
(figuratively) Under water.
(finance) having negative equity; owing more on an asset than its market value
Synonyms
• (beneath the water surface): subaqueous, subaquatic, submarine
• (having negative equity): upside down
Adverb
underwater (comparative more underwater, superlative most underwater)
going beneath the surface of the water
Noun
underwater (plural underwaters)
underlying water or body of water, for example in an aquifer or the deep ocean
(fishing) A type of lure which lies beneath the water surface.
Verb
underwater (third-person singular simple present underwaters, present participle underwatering, simple past and past participle underwatered)
(agriculture, horticulture) to water or irrigate insufficiently
Antonyms
• overwater
Source: Wiktionary