all, completely, etc. at sea

all at sea

Puzzled, perplexed, or completely confused (about a subject or some task at hand). I tried to do well in this class, but I've been all at sea since we started.
See also: all, sea

all, completely, etc. at ˈsea

confused; not organized: We’re still completely at sea trying to understand the new regulations.
See also: sea