adjective, spinier, spiniest.
abounding in or having spines; thorny, as a plant.
covered with or having sharp-pointed processes, as an animal.
in the form of a spine; resembling a spine; spinelike.
troublesome or difficult to handle; thorny: a spiny problem.

1580–90; spine + -y1

spininess, noun
nonspiny, adjective
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World English Dictionary
spiny (ˈspaɪnɪ)
adj , spinier, spiniest
1.  (of animals) having or covered with quills or spines
2.  (of plants) covered with spines; thorny
3.  troublesome to handle; puzzling
4.  shaped like a spine

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The sharp edges of the blue spiny lizard will not protect it against climate change.
The green spiny cactus contrasts with the exotic deep reds and oranges of the delicate bougainvillea.
And so it has to be a spiny form of foliage, but held on the tree in such a way
  as not to collect snow.
When attacking sea urchins, triggers often flip them over, exposing their less
  spiny undersides.
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