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: If you're not doing the mixing, in order for things to get mixed you call your ma (ま) up and ask her to mix it. What a terrible lazy child you are.
Oil doesn't mix with water.
Those colors mixed.
I felt really sad and lonely because I couldn’t contribute to the conversation at all.