Synonyms for Spiny:

adj.

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

n.

frothy, gilt, Cobbled, armor-plated, gold-plated, gilded, furry, foamy, gift-wrapped, grass. Echinate, Pricky. spiny (noun)
barbellate, bristled, briery, briary, barbed, burred, thorny, armed, prickly, burry, bristly.

Other synonyms:

Echinate, Pricky. nettlesome. Other relevant words:
briary, burred, nettlesome, armed, Pricky, bristled, briery, barbellate, Echinate, burry.

Usage examples for spiny

  1. Although it is not spiny like the triodia, it is almost as annoying, both to horse and man, as it grows too high for either to step over without stretching, and it is too strong to be easily moved aside; hence, horse- tracks in this region go zigzag. – Australia Twice Traversed, The Romance of Exploration Australia Twice Traversed. The Romance Of Exploration, Being A Narrative Compiled From The Journals Of Five Exploring Expeditions Into And Through Central South Australia, And Western Australia, From 1 by Ernest Giles