い-adjectives are one of the two main adjective types in Japanese — and they cover a huge range of daily expression. From feelings and personality to food, weather, and prices, these 43 adjectives come up constantly. The best part: once you learn the conjugation pattern once, every single one of them works the same way.

Emotions & Feelings

Twelve core adjectives for expressing your inner state — the ones you'll reach for every single day in Japanese.

Happy / glad嬉しいureshii

合格できて嬉しいです！ — I'm so glad I passed!

Fun楽しいtanoshii

この授業は楽しいです。 — This class is fun.

Sad悲しいkanashii

あの映画は悲しかったです。 — That movie was so sad.

Lonely寂しいsabishii

一人でいると寂しいです。 — I feel lonely when I'm alone.

Empty / hollowむなしいmunashii

終わった後、むなしい気持ちになりました。 — After it was over, I felt empty inside.

Miss / long for恋しいkoishii

日本が恋しいです。 — I miss Japan so much.

Embarrassing恥ずかしいhazukashii

人前で話すのが恥ずかしいです。 — I get embarrassed speaking in front of people.

Nostalgic懐かしいnatsukashii

この曲を聞くと懐かしいです。 — This song makes me feel nostalgic.

Interesting / funny面白いomoshiroi

この映画はとても面白いです。 — This movie is really interesting.

Boringつまらないtsumaranai

この本はつまらないです。 — This book is boring.

Cuteかわいいkawaii

その猫はかわいいですね。 — That cat is so cute.

Scary怖いkowai

暗い道は怖いです。 — Dark streets are scary.

Personality & Character

Use these to describe people — compliments, criticisms, and everything in between.

Cool / good-lookingかっこいいkakkoii

あの俳優はかっこいいですね。 — That actor is really cool.

Kind / gentle優しいyasashii

先生はとても優しいです。 — The teacher is very kind.

Strict厳しいkibishii

コーチはとても厳しいです。 — My coach is very strict.

Reliable頼もしいtanomoshii

彼は頼もしくて、安心します。 — He's so reliable, I feel at ease.

Knowledgeable詳しいkuwashii

彼は日本の歴史に詳しいです。 — He knows a lot about Japanese history.

Suspicious怪しいayashii

あの人、怪しいですね。 — That person over there looks suspicious.

Obviously fake白々しいshirajirashii

その言い訳は白々しいですね。 — That excuse is so obviously fake.

Weak-willed女々しいmemeshii

そんな女々しいことを言わないでください。 — Don't be so weak-willed about it.

Food & Taste

Four essential adjectives for reacting to food — some of the most useful words you'll use in Japan.

Deliciousおいしいoishii

このケーキ、おいしいですね！ — This cake is delicious!

Bad-tastingまずいmazui

これ、ちょっとまずいですね。 — This tastes a bit off.

Sweet甘いamai

このいちごはとても甘いです。 — These strawberries are very sweet.

Spicy辛いkarai

この料理は辛すぎます。 — This dish is too spicy.

Weather & Senses

Describing the world around you — temperature, beauty, and what you see and feel.

Hot (weather)暑いatsui

今日は本当に暑いですね。 — It's really hot today.

Cold寒いsamui

冬は寒いのが苦手です。 — I don't like the cold in winter.

Warm暖かいatatakai

春は暖かくて気持ちいいです。 — Spring is warm and pleasant.

Cool / refreshing涼しいsuzushii

木陰は涼しいですね。 — It's nice and cool in the shade.

Beautiful美しいutsukushii

桜が美しいですね。 — The cherry blossoms are beautiful.

Bright / dazzling眩しいmabushii

太陽の光が眩しいです。 — The sunlight is so bright.

Cute (soft nuance)可愛らしいkawairashii

その子は可愛らしいですね。 — That child is so adorable.

Everyday Life & General

From busy days to wonderful moments — versatile adjectives for real daily conversation.

Busy忙しいisogashii

最近、すごく忙しいです。 — I'm really busy these days.

Difficult難しいmuzukashii

日本語は難しいです。 — Japanese is difficult.

Noisy / lively騒がしいsawagashii

今日は教室が騒がしいですね。 — The classroom is really noisy today.

Expensive / tall高いtakai

このレストランは高いですね。 — This restaurant is pretty expensive.

Cheap安いyasui

このお店は安くておいしいです。 — This shop is cheap and delicious.

New新しいatarashii

新しいアパートに引っ越しました。 — I moved into a new apartment.

Old古いfurui

この神社はとても古いです。 — This shrine is very old.

Wonderful素晴らしいsubarashii

パフォーマンスは素晴らしかったです！ — The performance was wonderful!

Rare / unusual珍しいmezurashii

この地域では雪は珍しいです。 — Snow is rare in this area.

Equal等しいhitoshii

両側は等しいです。 — Both sides are equal.

Foolish / ridiculous馬鹿らしいbakarashii

それは馬鹿らしいですね。 — That's just ridiculous.

So close!惜しいoshii

惜しい！あと一点だったのに。 — So close! Just one point short.

4 Tips for Conjugating い-Adjectives

Past tense: drop い → add かった. 楽しい (fun) → 楽しかった (was fun). 難しい → 難しかった (was difficult). Works for every single い-adjective without exception.
Negative: drop い → add くない. 怖い (scary) → 怖くない (not scary). 暑い → 暑くない (not hot). Past-negative: 暑くなかった (wasn't hot).
て-form connects ideas: drop い → add くて. 安くておいしい = cheap and delicious. 楽しくて嬉しい = fun and happy. Use this to chain two descriptions together.
Adverb form: drop い → add く. 優しい (kind) → 優しく (kindly). 早い (fast) → 早く (quickly). This turns an adjective into an adverb you can attach to verbs.

FAQ

What's the difference between 暑い (atsui) and 熱い (atsui)?

Same reading, different kanji. 暑い is for hot weather or ambient temperature ("it's hot outside"). 熱い is for a physically hot object — "hot coffee," "hot soup." Context usually makes it clear; the kanji removes all ambiguity in writing.

Is つまらない really an い-adjective?

Yes — it ends in ない (which ends in い), so it conjugates exactly like an い-adjective. Past tense: つまらなかった (was boring). Negative: つまらなくない (not boring). Same rules, no exceptions.

How do I say "too ~"?

Drop the final い and add すぎる: 高すぎる (too expensive), 辛すぎます (too spicy), 難しすぎる (too difficult). Works identically for all い-adjectives.

What's the difference between 楽しい and 嬉しい?

楽しい describes an activity being enjoyable — "the party was fun." 嬉しい describes the personal feeling of gladness — "I'm happy you came." 楽しい = it's fun; 嬉しい = I feel glad.

Practice All 43 い-Adjectives with Onigiri Anki

Onigiri's spaced repetition system drills all 43 of these adjectives until they feel automatic — not just memorized for today, but locked in long-term. Start on web or grab the iOS app:

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43 Essential Japanese い-Adjectives in 2026