Nausea: a symptom associated with discomfort and feeling ill. Nauseous- The act of experiencing nausea. Examples- Rollercoasters make me feel nauseous. I feel nauseous. In past tense it can be expressed in two methods: You can change the root verb (The rollercoaster MADE me feel nauseous; I FELT nauseous) or change both the word and the root verb (I WAS NAUSEATED after riding the rollercoaster; I was nauseated). Nauseated can also be used as a present tense term: "Do you feel nauseated?", which is the same as asking "Do you feel nauseous?" Nauseating- Describes an object or experience that induces a feeling of nausea. Example- My headache is nauseating (meaning I have a headache that is so severe it makes me feel ill).

Nausea: 1. A stomach disturbance characterized by a feeling of the need to vomit. 2. Strong aversion; repugnance; disgust. Nauseate (nauseated, nauseating): Transitive. 1. To cause to feel nausea; make queasy. 2. To cause to feel loathing or disgust. Intransitive. To feel nausea or queasiness; be queasy. The smell in this place nauseates me. Nauseated: suffering from nausea. Something I ate has made me nauseated. Let me rest for a while. I feel nauseated. Nauseous: 1. causing nausea; sickening. 2. Intellectually repulsive: ”What proper person can be partial / To all those Nauseous epigrams of Martial? (Byron). 3. Nauseated A noxious gas can be nauseating. The use of “nauseous” for “nauseated” has become more widespread among recent generations in the US but the employment of “nauseous” in the sense of “nauseated” (experiencing nausea) is not considered acceptable by most (86%) of the grammarians associated with The American Heritage Dictionary of the English Language..