Finnish adjectives come before the noun, as in English: iso talo — a big house, pieni koira — a small dog. Or after olla: Talo on iso. — The house is big.

Finnish	English	Finnish	English
iso / suuri	big	pieni	small
uusi	new	vanha	old
hyvä	good	huono	bad
kaunis	beautiful	ihana	lovely
hauska	fun, funny	mukava	nice
onnellinen	happy	väsynyt	tired

And since there's no gender, the adjective is the same for everyone: Marcos on väsynyt. Marina on väsynyt.

To say very, put hyvin in front: hyvin kaunis — very beautiful. In speech you'll often hear tosi (really): tosi kiva.