Nauseous/ˈnɔːʃəs/ Definition 1 of 2Pro Tip 1/3Physical Sensation Use 'nauseous' to express physical discomfort related to the stomach. Spinning around too fast left me feeling nauseous. Pro Tip 2/3Pre-Vomit Feeling 'Nauseous' often implies you're on the verge of throwing up. After eating spoiled food, I felt nauseous. Pro Tip 3/3Not Always Illness 'Nauseous' can describe queasiness from various non-disease causes. The choppy boat ride made the passengers nauseous.