I am a little bit angry. I am kind of angry.
I searched the two phrases, but can't found the difference. Are them the same?
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Kind of is an informal phrase which means to some extent. In that sense, it means the same as "little bit."
"Kind of" may also imply some vagueness, which may indicate the emotion being felt is not pure anger or there is some uncertainty about the anger being felt, although, from the example, it's probably being used to mean "a little bit."
The term "sort of" is also often used, interchangeably with "kind of" and "a little bit"--more colloquial forms might be "kinda," "sorta," and "a little."