nau·seous \ˈnȯ]shəs, ]zēəs, ]sēəs, ]zhəs\adjective Etymology: Latin nauseosus causing nausea, from nausea + -osus -ous 1.: affected with or inclined to nausea : nauseated < began to feel nauseous > 2.: causing or such as might be expected to cause nausea : sickening, loathsome, disgusting < a nauseous odor > < nauseous hypocrisy > • nau·seous·lyadverb • nau·seous·nessnoun-es