feeling as though one will vomit, affected with sickness/queasiness or nausea;
e.g. They began to feel nauseous as the boat was tossed around.
(adjective)
causing one to feel disgust or be affected with nausea, causing one to feel as though they will vomit, usually due to being offensive to smell or taste;
e.g. They opened the window to let the nauseous smell out of the room.
(adjective)
generally offensive, disgusting, or repellent;
e.g. They went on with their nauseous dishonestly until they couldn't get away with it any more.