desafiador /de.za.fi.aˈdoɾ/ (BR) Adjective

English: challenging
ไทย: ท้าทาย

Example

Foi uma caminhada [desafiadora], mas a vista valeu a pena.
It was a challenging hike, but the view was worth it.
Aqui, 'desafiadora' foca na superação física.