Nauseous means feeling as though you are about to be sick. Feel nauseous, nauseous with fear, a nauseous smell.
Purists insisted for years that nauseous means causing nausea and nauseated means feeling it, so that saying you feel nauseous meant you make others ill. That battle is lost and both senses are standard. The Greek naus means a ship, so nausea is seasickness.
1adjectivenauseousFeeling as though you are about to be sick.
“The boat trip made me feel nauseous, so I stood at the back and watched the horizon.”
nauseous is a state of feeling.
Latin nauseosus comes from nausea, from Greek naus, a ship. The word originally meant seasickness.
Latin
nauseōsus — causing nausea
English, today
nauseous
From Latin nauseōsus (“causing nausea”), corresponding synchronically to nausea + -ous.
Etymology from Wiktionary, CC BY-SA