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Related to at sea: All at Sea
(all) at sea (about something)
Fig. to be confused; to be lost and bewildered. (Alludes to being lost at sea.) When it comes to higher math, John is totally at sea.
1. Lit. on the sea; away on a voyage on the ocean. The ship is at sea now, and you can't disembark. I spent many happy days at sea on my cruise.
2. Fig. confused; at a loss. Bill was at sea over the calculus problem. Reading economic theory leaves me feeling at sea.
confused With no data they could depend on, they were utterly at sea.
1. Aboard a ship, on the ocean, as in Within a few hours the ship would be out at sea. During World War II a famous American newscaster addressed his radio broadcasts to listeners everywhere, including "all the ships at sea." [1300s]
2. Also, all at sea. Perplexed, bewildered, as in She was all at sea in these new surroundings. This idiom transfers the condition of a vessel that has lost its bearings to the human mind. Charles Dickens used it in Little Dorrit (1855): "Mrs. Tickit ... was so plainly at sea on this part of the case." [Second half of 1700s]
1. On the sea, especially on a sea voyage.
2. In a state of confusion or perplexity; at a loss.