un cauchemar
Avez-vous jamais eu un cauchemar ? - Have you ever had a nightmare?
Cet examen d'histoire va être un cauchemar ! - This history test is going to be a nightmare!
Related: cauchemarder - to have a nightmare; cauchemardesque (adj) - nightmarish; cauchemardeux (adj) - nightmarish
(click the little graphic below to hear the Mot du jour pronounced)
Pronunciation: [ko sh(eu) mahr]