Masculine adjectives ending in -s or -x stay the same in the plural. Examples are dangereux (dangerous), heureux (happy), ennuyeux (boring), gros (fat) and frais (fresh). ... There are, however, some adjectives ending in -al that just add -s to form the plural.
Is Ennuyeux masculine or feminine in French?
The French translation for “boring (masculine)” is ennuyeux.
What is the plural of loyal in French?
Word forms: loyal, loyale, masculine plural loyaux.