JEALOUS - [adjective] feeling angry towards somebody, because they have something that you want
Examples of use
He's jealous of his girlfriend when somebody else even looks at her.
She was a jealous child and never got on with children who had more than she did.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her