Malicious, Mean, Jerk
な adjective, noun
A person whose ideas are grounded in evil is a malicious, mean jerk!
いじわる
This reading is a combination of the on'yomi readings for 意 and 地, and the kun'yomi reading for 悪. You've learned them all already, but since 地 has two on'yomi readings, here's a mnemonic to help you remember which one to use: Malicious, mean jerks get sent to Jesus (じ) to sort them out. If anyone can sort out those malicious jerks, it’s Jesus!
意地悪しちゃダメだよ。
You shouldn't be mean.
そんな意地悪なこと言わないでよ。
Don't say such mean things.
どうして妹に意地悪ばっかりするの！
Why are you so mean to my little sister?!