orneriness 1. Having an irritable disposition; cantankerous (difficult or irritating to deal with). 2. Mean-spirited, disagreeable, and contrary in disposition. This word is NOT related to the onus-, oner- Latin family of words. It is included in this unit only for purposes of clarification and to help anyone who thinks these orneriness and orner... Found on http://www.wordinfo.info/words/index/info/view_unit/4075/