Is it safe to use an adaptor to plug a 3-prong appliance into a 2-prong wall outlet?

I recently bought a new electric kettle, and only when I got home did I realize it has a 3 prong cord and I have 2 prong outlets throughout my house. Is it okay to use an adaptor to plug in my kettle to the wall? Really not in the question to be upgrading all my wall outlets to 3-prongs right now. Thanks!
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