Since this word has okurigana (hiragana attached to the kanji) you know that it's probably going to be the kun'yomi reading. You didn't learn this with the kanji, so here's a mnemonic to help you out:
When you get sick, your mom calls every day to ask, "Are you better now (なお)?" How about NOW!? How about NOW!? Jeez Mom, just let me rest!
Your disease will most definitely be cured.
His injuries have healed, but the scars remain.
Do you know the saying "stupidity can never be cured"?