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:
When you start to grow senile you'll make a new friend. It's Bobo (ぼ) the clown! No one else can see him though, but that's okay! He'll become your very best friend. And he won't leave until you finally kick the bucket.
That actor is really good at acting senile.