Definition of "unstressed"

Type D half-lines ending in words of this type are analysed by Hutcheson as ending in two completely unstressed syllables. That analysis must be descriptively correct for, say, the 10th cent.; whether it would have fitted the facts in the 8th cent. is much less clear.

2004 October 14, Don Ringe, “Old English maþelian, mæþlan, mǣlan”, in J. H. W. Penney, editor, Indo-European Perspectives: Studies in Honour of Anna Morpurgo Davies‎, Oxford University Press, page 427