spiny

American  

[spahy-nee] / ˈspaɪ ni /

adjective

spinier, spiniest

1. abounding in or having spines; thorny, as a plant.

2. covered with or having sharp-pointed processes, as an animal.

3. in the form of a spine; resembling a spine; spinelike.

4. troublesome or difficult to handle; thorny.

   a spiny problem.

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spiny British  

/ ˈspaɪnɪ /

adjective

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

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Other Word Forms

• spininess
  noun
• nonspiny
  adjective

Etymology

Origin of spiny

First recorded in 1580–90; spine + -y ¹

Explanation

Spiny things are prickly or barbed, like a porcupine or a cactus. You have to be careful when you pick up something spiny. There are many spiny plants and animals, including roses, fish with spiny fins, sea urchins, and hedgehogs. They're all spiny for the same reason—as a defense against predators. The barbs or thorns themselves are called spines, from the Latin spina, meaning "backbone" and also "thorn or prickle." You can also use spiny figuratively to describe something difficult to deal with: "It was a spiny problem indeed."

Example Sentences

See Examples For:

spiny spinier

In recent years, Lentali has congratulated Musk on company news, and even invited him to the French island to eat “local fish and spiny lobster.”

From The Wall Street Journal ● Mar. 16, 2026

They also found many arthropods -- a family that includes modern-day crabs and insects -- including spiny, stalk-eyed creatures called radiodonts which were the apex predator of the time.

From Barron's ● Jan. 28, 2026

British gardens matter more than ever for hedgehogs, according to a study of the secret night life of the spiny mammals.

From BBC ● Jan. 19, 2026

“Then make sure to cool it immediately to prevent holdover temperature from overcooking the spiny little beast!”

From Salon ● Sep. 1, 2024

From our spot in a clearing between some dried Lydia brooms and spiny mesquite brush, we watched the moon as it rose higher into the sky above the canyon rim.

From "100 Sideways Miles" by Andrew Smith

But her spinier attributes emerge when her beauty idyll is crashed by a rowdy extended family of holidaymakers with various squealing children in tow.

From Los Angeles Times ● Dec. 16, 2021

Martin imagined when writing his "Song of Ice and Fire" books; that one is bigger and spinier.

From Salon ● Oct. 6, 2021

He’s surrounded by spinier, more surprising arrangements, too.

From The Verge ● Sep. 11, 2015