From The Collaborative International Dictionary of English v.0.48 :
Round-shouldered \Round"-shoul`dered\, a.
Having the shoulders stooping or projecting; round-backed.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
round-shouldered
adj 1: having the back and shoulders rounded; not erect; "a
little oldish misshapen stooping woman" [syn: hunched,
round-backed, round-shouldered, stooped,
stooping, crooked]