épineux
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Meanings
Adjective
1. spikey; spiny
2. spikey; abrasive, nettlesome (figuratively)
3. deliberately difficult or awkward (figuratively, of a person)
4. spinous, spinal
Examples6
It's a knotty issue.
It's a knotty problem.
That's a very delicate subject.
We have a rather vexing problem.
The project has proved thornier than we hoped.
The question of free will is a prickly conundrum to religion.