Nauseous. Nauseated[usage-nauseous-nauseated]

Nauseous、Nauseated。第一个意为"sickening to contemplate"（令人作呕）；第二个意为"sick at the stomach"（胃里难受）。因此，不要说"I feel nauseous"，除非你确信自己对别人有那种令人作呕的效果。