Definitions for nubbyˈnʌb i
Random House Webster's College Dictionary
nub•byˈnʌb i(adj.)-bi•er, -bi•est.
having nubs; knobby or lumpy.
homespun(p), nubby, nubbly, slubbed, tweedy(adj)
of textiles; having a rough surface
"a sweater knitted of nubbly homespun yarns"