Synonyms for Thistly:

adj.

sharp (adjective)
cutting, pointed, needle-like, sharp, bristly, spinous, spear-like, sagittal, prickly, barbed, jagged, acute, spiked, needle-point, razor-edged, thorny, spiny, keen, spiky, pointy.
thorny (adjective)
briery, Echinate, spinous, bristly, Pricky, spiky, barbed, prickly, spiny, spiked.

n.

Echinate, Pricky, briery.

Other synonyms:

Echinate, Pricky, briery. Other relevant words:
Echinate, Pricky, briery.