遺憾千万 (いかんせんばん) — extremely regrettable; deeply unfortunate; most disappointing; utterly deplorable
遺憾千万
Extremely regrettable; deeply unfortunate; most disappointing; utterly deplorable
君
がそれを
知
らないのは
遺憾千万
だ
。
It is a great pity that you don't know it.
Image search

