1 emptiness

2 void

3 abstract theory or guiding principles

4 empty or unoccupied

5 diffident or timid

6 false

7 humble or modest

8 (of health) weak

9 virtual

10 in vain

1 surname Guan

1 mountain pass

2 to close

3 to shut

4 to turn off

5 to concern

6 to involve

1 to ally

2 to unite

3 to join

4 (poetry) antithetical couplet