虚
xū
I s.v.
1) empty; unoccupied
2) diffident; timid
3) weak; in poor health
II b.f.
1) false; faked (虚伪)
2) nominal (虚设)
3) humble; modest (谦虚)
4) virtual (虚象)
5) guiding principles; theory (务虚, 以虚带实)
III n.
1) void; emptiness
2) 11th of the 28 constellations
IV adv.
in vain