Usage Note
périlleux agrees in gender: feminine périlleuse, plural périlleux / périlleuses. The double 'l' and silent final 'x' are spelling points to note. The set phrase saut périlleux (somersault — literally 'perilous leap') is widely used in gymnastics and circus arts. The related noun is péril (peril, danger).
Examples
"La traversée en montagne était très périlleuse."
Natural Translation
The mountain crossing was very perilous.

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