Bíonn séimhiú ar an aidiacht a théann le ainmfhocal baininscneach.
Note: an adjective that goes with a feminine noun takes a séimhiú,
Note: that in Irish the adjective is usually after the noun.

Bíonn an aidiacht gan athrú san Ainmneach sa Chuspóireach agus sa Tabharthach.

Note: adjective stays the same for the Nominative the Accusative and the Dative.