nau ‧ se ‧ ous /ˈnɔːziəs, -siəs $ -ˈnɒːziəs, -ʃəs/ BrE AmE adjective
1 . especially American English feeling that you are going to ↑ vomit SYN sick :
I felt slightly nauseous.
The taste made me nauseous.
2 . formal making you feel that you are going to ↑ vomit :
a nauseous smell