Adjectives have cases and plural forms just like nouns. The inflection rules are the same as for nouns, except for a few special rules presented in the descriptions of cases. An adjective that appears as an attribute of a noun generally congrues with it, i.e. the adjective has the same case form as the noun, e.g. iso talo : ison talon : isossa talossa.
However, there is a small set of adjectives that have no inflection, such as viime (latest, last), ensi (next), and pikku (small). They are used only as attributes, and they always precede the noun that they determine. For example, we say viime kesä (the last summer), viime kesän (of the last summer), viime kesällä (last summer), etc.
Adjectives very often end with nen in the nominative so that their stem in other cases ends with se, e.g. punainen : punaiset (red). However, this is not a special feature of inflection of adjectives; the same principle is applied to nouns, too, e.g. hevonen : hevoset (horse).