coriace

Dictionnaire

Google est coriace.

Google is more difficult.
Le fruit est coriace, sec de la forme d'une soucoupe volante.

The fruit is tough, dry, of the shape of a flying saucer.
Il suffit parfois d’une coquille de moule particulièrement coriace…

He wrongly believed that the European Health Insurance Card would give him access to the same free treatment he usually got on the National Health Service at home in the UK.
La prochaine fois, j'espère avoir une question un peu plus coriace.

Next time hopefully I will get a tougher question.
Durant toutes ces années, le rapporteur s' est montré un négociateur coriace.

The rapporteur has shown himself to be a tough negotiator over all these years.