/'frækʃəs/ a. Syn. unruly; disobedient; irritable (蠻橫倔強的) inclined to make trouble; disobedient; irritable Bucking and kicking, the fractious horse unseated its rider.
/mɜrkjʊərɪəl/ a. Syn. capricious (善變的,無常的) capricious; liable to sudden unpredictable change; quick and changeable in temperament Quick as quicksilver to change, he was mercurial in nature and therefore unreliable.