spiky

Everyday

1. Something spiky has many sharp points sticking out: a spiky cactus, a spiky shell. tree →
2. Spiky hair is stiff and sticks up in points. tree →
3. (informal) A spiky person is easily annoyed and unfriendly. tree →

In the lessons

In science lessons spiky plants and animals (hedgehogs, cacti, sea urchins) use spikes to protect themselves; in safety lessons spiky things can hurt you. In stories it describes looks and moods. Phrases: spiky hair, a spiky ball, spiky leaves.

Examples

• Hedgehogs have spiky backs. tree →
• Don't touch the cactus, it's very spiky. tree →
• He used gel to make his hair spiky. tree →
• The conker case is green and spiky. tree →
• A spiky shape has lots of points, like a star. tree →
• Grandpa gets a bit spiky when he is tired. tree →
• The sea urchin is the spikiest thing in the rock pool. tree →

Note

Comparative: spikier, spikiest. From «spike» (a sharp point) + «-y». Similar words: prickly (with small sharp points), pointy, sharp. «Prickly» also means easily annoyed.