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noun, な adjective
I'm going to expose my bones for a second here and be blunt with you... this makes sense, because if you're exposing your bones at someone, you're not hiding anything. You're being frank and blunt.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
I was pretty surprised at how blunt she was.