Definitions

1. adjective

feeling or experiencing nausea or discomfort due to the motion of a ship or a boat at sea.

“After a long night at sea, the sailor was feeling seasick and couldn’t even keep water down.”

2. noun

a feeling of nausea or discomfort caused by the motion of a ship or a boat at sea.

“The seasickness was so bad that she had to stay in the cabin all day.”