Sulk'i·ness noun [ For sulkenness , from Anglo-Saxon solcen slothful, remiss, in ā solcen , be solcen , properly past participle of sealcan in ā sealcan to be weak or slothful; of uncertain origin.] The quality or state of being sulky; sullenness; ... Found on http://www.encyclo.co.uk/webster/S/235