くも
yokumo

Adverb

1. how dare ...; how could ...

Usually Written in Kana
よくも かおをつぶしてくれたな。
yokumo kaō tsubushite kuretana.
You really made me lose face.
よくも彼女 かのじょにそんなことがいえるものだ。
yokumo kanojoni sonna kotoga ieru monoda.
How dare you say such a thing to her!
Adverb

2. surprisingly; unexpectedly

Usually Written in Kana