Sentence:  “[…] it is not fair of you to bring against mankind double weapons&thinsp;! Dangerous <WSD>enough</WSD> you are as woman alone, without bringing to your aid those gifts of mind suited to problems which men have been accustomed to arrogate to themselves.” 
Meaning of the word marked with <WSD> tags:  Fully; quite; used to express slight augmentation of the positive degree, and sometimes equivalent to "very".