Hidden or undisclosed.
Being lower; being beneath something.
Below the level of the surrounding or adjoining area
Adapted for underwater use or existence; underwater
Marine is defined as something related to water or the sea.
Growing or remaining under water:
Find another word for underwater. In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for underwater, like: submarine, under, sunken, undersea, subaqueous, subaquatic, submerged, deep-sea, marine, submersed and under-water.