I am currently working on compiling a Simlish-English Dictionary on Facebook. Join my group and help contribute your finds.
http://www.facebook.com/group.php?gid=10278450917
I will also be creating a website for the dictionary after I have more words Isn't that kinda stupid to learn their language? What do you need it for? You see their needs at the Need Bar, or in the little cloud above their head. I read somewhere that they used Navajo and Ukrainian languages when building Simlish.
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You can find the Simlish dictionary online on websites such as The Sims Wiki or fan-run Simlish dictionaries. These resources compile and provide definitions for the fictional language used in The Sims video game series.