Synonyms of underwater

Adjective

1. submerged, submersed, underwater, subsurface (vs. overhead) (vs. surface)

usage: beneath the surface of the water; "submerged rocks"

2. subaqueous, subaquatic, submerged, submersed, underwater, aquatic (vs. terrestrial) (vs. amphibious)

usage: growing or remaining under water; "viewing subaqueous fauna from a glass-bottomed boat"; "submerged leaves"

Definition and meaning of underwater (Dictionary)