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:
On your quest for true happiness, you meet a happiness guru. She always says (しあわせ), "just be happy!" She always says that, and you always listen. You can't believe how simple yet profound her approach is!
I wish you happiness for many years to come.
A fortune teller told Viet that happiness will come to him within the year.
"I think money can buy happiness because watching fireworks makes me happy. If I had a lot of money, I could enjoy fireworks every day and feel happy all the time," she said happily.