The phrase "at sea" can refer to a state of being lost or confused. Synonyms for this phrase could include "disoriented," "bewildered" or "adrift." Alternatively, "at sea" could also refer to being in a state of uncertainty or lack of direction. Synonyms for this meaning could include "uncertain," "undecided" or "in limbo." "At sea" could also describe an individual who is experiencing an emotional turmoil. In this context, synonyms could include "troubled," "distressed" or "upset." Whatever the context, there are plenty of synonyms available to describe the sensation of being "at sea".