The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

nauseated
    adj 1: feeling nausea; feeling about to vomit [syn: nauseated,
           nauseous, queasy, sick, sickish]