1. Feeling nausea; feeling about to vomit
   "The rough seas made many passengers queasy";
   - nauseated, nauseous, sick, sickish
    
2. Causing or able to cause nausea
   "the queasy flight had bad turbulence";
   - nauseating, nauseous, sickening, vomitous [US]
    
3. Characterized by or causing worry, tension or apprehension
   "There was a queasy atmosphere in the waiting room";
   - anxious, nervous, uneasy, unquiet

Derived forms: queasier, queasiest

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