Most adjectives ending in -al change to -aux (masculine plural) or -ales (feminine plural) - see Forming the plural of adjectives ending in -al in French - but there are exceptions to that rule.
Look at these cases:
The following adjectives are exceptions which take -s in the masculine plural form:
| Masculine singular | Masculine plural | English |
| banal | banals | banal / ordinary |
| bancal | bancals | wobbly / rickety |
| fatal | fatals | fatal / lethal |
| naval | navals | naval |
| natal | natals | natal |
| glacial | glacials / glaciaux | freezing |
| final | finals / finaux | final |
ATTENTION:
Both plural forms of glacial and final are accepted in French: regular (glaciaux / finaux) and irregular (glacials / finals)
See also Forming the plural of French nouns ending in -al
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