When a dictionary is created much of the HTML markup is removed and converted into various indexes. Kindlegen attempts to undo that conversion but it does not handle every possible case.
I might be able to look into this in more detail if I can locate the specific dictionary that you are using. I took at look at the English language dictionaries on my Oasis 2. They are "Oxford Dictionary of English_B0053VMNYW" and "The New Oxford American Dictionary_B0053VMNY2". Neither has the same definition for "careful" as your dictionary.
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