Source : Webster's Revised Unabridged Dictionary (1913)

Uncomfortable \Un*com"fort*a*ble\, a.
   1. Feeling discomfort; uneasy; as, to be uncomfortable on
      account of one's position.

   2. Causing discomfort; disagreeable; unpleasant; as, an
      uncomfortable seat or situation.

            The most dead, uncomfortable time of the year.
                                                  --Addison.
      -- {Un*com"fort*a*ble*ness}, n. -- {Un*com"fort*a*bly},
      adv.

Source : WordNet®

uncomfortableness
     n 1: the state of being tense and feeling pain [syn: {discomfort}]
          [ant: {comfort}]
     2: embarrassment deriving from the feeling that others are
        critically aware of you [syn: {self-consciousness}, {uneasiness}]