 Adjectives with a consonant before the ending usually form the feminine with -η, those with a vowel before the ending in -α and some adjectives that end in -κός ([-ˈkos], "-kos") or -χός ([-ˈxos], "-chos") usually form it in -ια although the ending -η is applicable for those too.Other classes of adjectives include those that take forms in -ης ("-is") in both masculine and feminine and in -ες ("-es") in neuter.They are declined similarly with the ancient declension.