Disaster, Misfortune
noun
This is the noun form of disaster, so it means disaster or misfortune.
わざわい
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: Think about how, the last time disaster struck, it was a while (わざわ) before things got back to normal. Be careful of the い on the end, it can be tricky and make you think it's an adjective when it's a noun.
このお守りが、きっとあなたを災いから守ってくれるでしょう。
This amulet will surely protect you from disaster.
その人形が、この村に多くの災いをもたらしたんです。
That doll brought a lot of misfortune to this village.
口は災いの元だよ。
The mouth is the source of calamity.