From The Collaborative International Dictionary of English v.0.48 [gcide]: Nauseate \Nau"se*ate\, v. i. [imp. & p. p. Nauseated; p. pr. & vb. n. Nauseating.] [L. nauseare, nauseatum, fr. nausea. See Nausea.] To become squeamish; to feel nausea; to turn away with disgust. [1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
nauseated
adj 1: feeling nausea; feeling about to vomit [syn: nauseated,
nauseous, queasy, sick, sickish]