Source : Webster's Revised Unabridged Dictionary (1913)

Infelicity \In`fe*lic"i*ty\, n.; pl. {Infelicities}. [L.
   infelicitas: cf. F. inf['e]licit['e]. See {In-} not, and
   {Felicity}.]
   1. The state or quality of being infelicitous; unhappiness;
      misery; wretchedness; misfortune; want of suitableness or
      appropriateness. --I. Watts.

            Whatever is the ignorance and infelicity of the
            present state, we were made wise and happy.
                                                  --Glanvill.

   2. That (as an act, word, expression, etc.) which is
      infelicitous; as, infelicities of speech.

Source : WordNet®

infelicity
     n : inappropriate and unpleasing manner or style (especially
         manner or style of expression) [ant: {felicity}]