WordWeb Online

1. Causing or able to cause nausea
   "a queasy smell";
   - nauseating, nauseous, noisome, loathsome, offensive, sickening, vile, vomitous [US], loathful [archaic]
    
2. Feeling nausea; feeling about to vomit
   - nauseated, nauseous, sick, sickish
    
3. Causing or fraught with or showing anxiety
   - anxious, nervous, uneasy, unquiet

Derived forms: queasiest, queasier

See also: antsy [N. Amer, informal], fidgety, fretful, gut-wrenching, ill, itchy, keyed-up, on edge, restless, sick, troubled, twitchy [informal], unwholesome