All About Adjectives

There are two types of adjectives in Japanese: i-adjectives and na-adjectives. I-adjectives all end in "~ i," though they never end in "~ ei" (e.g. "kirei" is not an i-adjective.)

Japanese adjectives differ from their English counterparts. Although Japanese adjectives have functions to modify nouns like English adjectives, they also function as verbs when used as predicates. For example, "takai（高い）" in the sentence "takai kuruma （高い車）" means, "expensive". "Takai（高い）" of "kono kuruma wa takai （この車は高い）" means not just "expensive" but "is expensive". When i-adjectives are used as predicates, they may be followed by "~ desu（～です）" to indicate a formal style. "Takai desu （高いです）" also means, "is expensive" but it is more formal than "takai （高い）".
Here are lists of common i-adjectives and na-adjectives.
Common I-Adjectives

atarashii 新しい	new	furui 古い	old
atatakai 暖かい	warm	suzushii 涼しい	cool
atsui 暑い	hot	samui 寒い	cold
oishii おいしい	delicious	mazui まずい	bad tasting
ookii 大きい	big	chiisai 小さい	small
osoi 遅い	late, slow	hayai 早い	early, quick
omoshiroi 面白い	interesting, funny	tsumaranai つまらない	boring
kurai 暗い	dark	akarui 明るい	bright
chikai 近い	near	tooi 遠い	far
nagai 長い	long	mijikai 短い	short
muzukashii 難しい	difficult	yasashii 優しい	easy
ii いい	good	warui 悪い	bad
takai 高い	tall, expensive	hikui 低い	low
yasui 安い	cheap	wakai 若い	young
isogashii 忙しい	busy	urusai うるさい	noisy

Common Na-Adjectives

ijiwaruna 意地悪な	mean	shinsetsuna 親切な	kind
kiraina 嫌いな	distasteful	sukina 好きな	favorite
shizukana 静かな	quiet	nigiyakana にぎやかな	lively
kikenna 危険な	dangerous	anzenna 安全な	safe
benrina 便利な	convenient	fubenna 不便な	inconvenient
kireina きれいな	pretty	genkina 元気な	healthy, well
jouzuna 上手な	skillful	yuumeina 有名な	famous
teineina 丁寧な	polite	shoujikina 正直な	honest
gankona 頑固な	stubborn	hadena 派手な	showy