колючий in inglese:

National flower of Scotland is the thistle, a prickly leaved purple flower.

prickly family relationship

She soon began to plague him with her rather prickly vanity.

Could it be that her prickly attitude is just because she has period pains? No, couldn't be.

Who would have thought that the lowly tickle could offer a solution to the ancient and thorny philosophical problem of personhood?

thorny issue