有耶無耶
Common
I-adj
Noun
1
adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi)
yojijukugo
word usually written using kana alone
indefinite;hazy;vague;unsettled;undecided
その問題をうやむやにしておくことはできない。
We shouldn't leave the matter unsettled.