jíshǒu

thorny (problem) / intractable

jí

thorns

jípídòngwù

echinoderm, the phylum containing sea urchins, sea cucumbers etc

jílún

ratchet

jíbíQīngdǎolóng

Tsintaosaurus spinorhinus, a 10 meter long hadrosaur with a single horn on its duck-billed snout

jīngjí

thistles and thorns / brambles / thorny undergrowth

jīngjízàitú

lit. a path covered in brambles / a book of action beset by difficulties (idiom)

pījīngzhǎnjí

lit. to cut one's way through thistles and thorns (idiom) / fig. to overcome all obstacles on the way / to break through hardships / to blaze a new trail

shítúwòjí

to eat bitter fruit and lie on thorns (idiom); to share the hard life of the common people

jíchǔ

thorny problem / troublesome affair