Source : Webster's Revised Unabridged Dictionary (1913)

Sickish \Sick"ish\, a.
   1. Somewhat sick or diseased.

   2. Somewhat sickening; as, a sickish taste. -- {Sick"ish*ly},
      adv. -- {Sick"ish*ness}, n.

Source : WordNet®

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