For strong plurals, the plural is the same in all cases (which generally means that some ending is added to the singular form, e.g. -í, -anna, -acha, etc.); for weak plurals, the genitive plural is different to the plural form of the other cases (usually the nominative singular is formed by slenderisation (1st declension) or by adding -a (mostly 2nd declension), and the genitive plural is the same as the nominative singular (e.g. leabhar, npl. leabhair, gpl. leabhar; lámh, npl. lámha, gpl. lámh), but there are some 2nd and 5th declension nouns which end in a broad consonant in the genitive plural (e.g. súil, npl. súile, gpl. súl; lacha, npl. lachain, gpl. lachan), and a few irregular nouns which also have a weak plural (e.g. bean, npl. mná, gpl. ban; bó, npl. ba, gpl. bó)). In the plural, adjectives are lenited after a plural noun that ends with a slender consonant, regardless of case or gender (though in practice genitive plurals rarely, if ever, end in a slender consonant). Also, for nouns with weak plurals, the singular form of the adjective is used in the genitive plural (e.g. iasc na súl mór, not *móra).