Lisa's dictionary is different from widely-used real dictionaries. Here's what Merriam-Webster says[1]: Some assert that only envious is correctly used to

Lisa's dictionary is different from widely-used real dictionaries. Here's what Merriam-Webster says[1]: Some assert that only envious is correctly used to describe someone who feels or shows a very strong desire for something that belongs to someone else, but in truth both envious and jealous commonly carry this meaning. Jealous alone is used to describe someone who tends to suspect unfaithfulness. [1] https://www.merriam-webster.com/dictionary/envious https://www.merriam-webster.com/dictionary/envious