I'm jealous of people who can speak Japanese fluently.
I'm envious of you for being successful in business and looking good in sunglasses.
If I told my little sister that I got a boyfriend I think she would be jealous.
This is a single kanji with hiragana that ends in an い, meaning you know it's probably an adjective. What's the adjective form of envy? It's also envious!
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading, so you should be able to read this already!