空空 [ㄎㄨㄥ ㄎㄨㄥ; kong1 kong1]
empty
vacuous
nothing
vacant
in vain
all for nothing
air-to-air (missile)
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空空
空々
くうくう
adjectival nouns or quasi-adjectives (keiyodoshi)
noun (common) (futsuumeishi)
empty
vacant
void
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