Soy despistada O estoy despistada?
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3 Answers
It depends. The adjective has little to do with the use of ser or estar. It's your state of mind and the nature of the condition.
Estoy despistada -- I am absent-minded now, but usually I am not.
Soy despistada -- It is in my nature to be absent-minded.
As Franco pointed out the meaning changes depending on whether you use despistado with ser or estar. With estar there can be quite a few different meanings.
Ser despistado: to be forgetful, absent minded
Estar despistado: to be lost, confused, to be lost in thought, to be daydreaming

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