3 And not indifferent to womankind,

indifferent > fair, impartial

4 To whom no share in arms and chivalry

arms > {Feats of arms}

5 They do impart, nor make memory

memory > memorial; historical record

6 Of their brave gests and prowess martial;

gests > exploits, deeds prowess > valour

7 Scarce do they spare, to one or two or three, 8 Room in their writs; yet the same writing small

writs > writings, books small > {Sparse, inconsiderable; falling short of the usual standard}