Too Bad, Unfortunate, Regrettable, Disappointing
noun, な adjective
The remainder of your thoughts are very small. You've thought of everything you possibly can to solve this problem. In the end, the remainder of your thoughts is left with one phrase: "too bad." There's nothing else to think but the remainder.
ざんねん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
それは残念すぎますね。
That's so unfortunate.
折角のチャンスだったのに、残念です。
It was such a rare chance, so it's too bad that I missed it.
残念ながら、そのようですね。
Unfortunately, it seems that's right.