kōng xīn
hollow
empty headed
mindless
kòng xīn
fasting
on an empty stomach
wā kōng xīn si
to dig for thoughts (idiom); to search everything for an answer
to rack one's brains
kòng xīn r
erhua variant of 空心[kong4 xin1]
kōng xīn dà lǎo guān
fake important personage
sham
kōng xīn lǎo dà
pretentious and vacuous person