con·trar·i·ous \kən.ˈtrerēəs, (ˈ)kän.|t-\adjective Etymology: Middle English, from Old French contrarious, from Medieval Latin contrariosus, from Latin contrarius contrary + -osus -ous — more at contrary 1.obsolete: contrary in tendency or character : opposed, hostile 2. a.: perverse, refractory, antagonistic < contrarious moods > : vexatious < contrarious weather > b.archaic: prejudicial, harmful • con·trar·i·ous·lyadverb