The Collaborative International Dictionary of English v.0.48:

Moroseness \Mo*rose"ness\, n.
   Sourness of temper; sulenness.
   [1913 Webster]

         Learn good humor, never to oppose without just reason;
         abate some degrees of pride and moroseness. --I. Watts.
   [1913 Webster]

   Note: Moroseness is not precisely peevishness or fretfulness,
         though often accompanied with it. It denotes more of
         silence and severity, or ill-humor, than the
         irritability or irritation which characterizes
         peevishness.
         [1913 Webster]

WordNet (r) 3.0 (2006):

moroseness
    n 1: a gloomy ill-tempered feeling [syn: moroseness,
         glumness, sullenness]
    2: a sullen moody resentful disposition [syn: sulkiness,
       sullenness, moroseness, sourness]