thorny

Trier trusts his audience to understand that something deeper and more thorny is afoot here, without laying out information plainly.

The thorniest issues were bundled into a "mutirao" pact -- the summit's slogan, drawn from the Tupi-Guarani word for "collective effort."

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As the EU's digital rules are the subject of thorny relations with Washington, the bloc's tech chief Henna Virkkunen is also expected to meet the Americans.

One particularly thorny issue has been China's moves to restrict exports of rare earths, crucial to many sectors worldwide from automotive to electronics.