difficult; hard to do; troublesome; not easy; problematic; the opposite of 容易 róng​yì

to distinguish; to differentiate; to discriminate

(literary) high or low; relative merits or status; an imbalance in weight or quality. Originally refers to the way a carriage tilts up in the front or back. Frequently used in the phrase 不分轩轾 bù​fēn​xuān​zhì meaning "evenly matched" or "neck and neck".