Sentence:  If, on the other hand, you simply deny <WSD>flat out</WSD> that you can give a metaphysical account of the concept “woman,” on the grounds that women are not essentially like one another in any respect— a position that, it′s important to notice, entails a commitment to your thinking that the idea of giving such an account is at least coherent— then you leave yourself with a problem about how to justify a politics based on the oppression of women. 
Meaning of the word marked with <WSD> tags:  Bluntly, no holds barred, totally, outright.