A manner adverb answers one question: in what way is the action done? Fast or slow, neatly or sloppily, on purpose or by accident, with full effort or half-heartedly. In Japanese these words sit directly before the verb they color, and they come from two different wells — a productive machine that builds them from adjectives, and a large stock of stand-alone lexical words, many of them mimetic in origin. Knowing which well a word comes from tells you whether it needs a particle (に), takes an optional と, or takes nothing at all.
Two sources of "how"
Japanese does not have a single manner-adverb suffix the way English leans on -ly. Instead:
- Derived adverbs — built from adjectives by rule: i-adjectives take 〜く (速（はや）い → 速く "quickly"), na-adjectives take 〜に (丁寧（ていねい） → 丁寧に "politely/carefully"). This machinery is fully productive and gets its own page, Forming Adverbs: 〜く and 〜に.
- Lexical adverbs — their own words, memorized one at a time, unrelated to any adjective: ゆっくり (slowly), わざと (on purpose), 一生懸命（いっしょうけんめい） (with all one's effort), and the big mimetic family (ちゃんと, しっかり, きちんと).
Both kinds do the same job in the same slot. The difference that trips learners up is purely what particle, if any, they attach with.
Derived manner adverbs
These are the ones you can generate on demand. Chop 〜い off an i-adjective and add く; add に to a na-adjective stem.
もっと速く走れ！
motto hayaku hashire
Run faster!
先生は丁寧に説明してくれた。
sensei wa teinei ni setsumei shite kureta
The teacher explained it carefully and politely.
ノートにきれいに書いてください。
nōto ni kirei ni kaite kudasai
Please write it neatly in your notebook.
Here the に is obligatory — it's the na-adjective's adverbial ending, not decoration. 丁寧 and きれい are na-adjectives, so ×丁寧書く and ×きれく are both wrong.
Lexical manner adverbs
These you simply learn. The most useful early ones describe pace, effort, and intent:
もう少しゆっくり歩いてくれる？
mō sukoshi yukkuri aruite kureru
Could you walk a bit more slowly?
試験まで一生懸命勉強した。
shiken made isshōkenmei benkyō shita
I studied as hard as I could until the exam.
彼はわざと負けた。
kare wa wazato maketa
He lost on purpose.
わざと ("deliberately, on purpose") deserves a warning, because English speakers collide it with わざわざ ("going out of one's way to do something / taking the special trouble"). They are not interchangeable: わざと usually carries intent that is mischievous or pointed; わざわざ frames an action as a considerate (or, sarcastically, unnecessary) effort.
わざわざ駅まで迎えに来てくれた。
wazawaza eki made mukae ni kite kureta
They went out of their way to come meet me at the station.
The mimetic manner adverbs: ちゃんと, しっかり, きちんと
A cluster of extremely common manner adverbs are mimetic in origin — they belong, historically, to the sound-and-state-symbolism system, even though they now feel like plain vocabulary. These describe doing something properly, firmly, thoroughly:
ちゃんと歯を磨きなさい。
chanto ha o migakinasai
Brush your teeth properly.
この紐をしっかり結んでください。
kono himo o shikkari musunde kudasai
Tie this cord firmly.
部屋をきちんと片付けた。
heya o kichinto katazuketa
I tidied the room up properly.
There are fine shades among them: ちゃんと is "as it should be, no shortcuts" (broad, everyday); きちんと adds neatness and precision ("squared away"); しっかり stresses firmness, solidity, or thoroughness ("get a good grip / do it soundly"). They are the doorway to the whole onomatopoeia system — the same machinery, one step more vivid.
しっかり食べて、早く元気になってね。
shikkari tabete, hayaku genki ni natte ne
Eat well and get better soon, okay?
The に / と question — which particle, if any
This is the single most practical thing to sort out. Manner adverbs fall into three groups by how they attach:
| Adverb | Source | Attaches with |
|---|---|---|
| 静（しず）かに, 丁寧に, きれいに | na-adjective (derived) | に — required |
| 速く, 大（おお）きく, 早く | i-adjective (derived) | く — the ending itself |
| ゆっくり, しっかり, はっきり, にっこり | mimetic / lexical | bare, or optional と (ゆっくりと) — never に |
| ちゃんと, きちんと, わざと, ずっと | lexical (と already fused) | nothing — と is baked in |
| 一生懸命(に) | noun-like | optional に |
The rule of thumb: に belongs to na-adjective-derived adverbs. A mimetic/lexical adverb like ゆっくり never takes に — its optional particle is と. So ×ゆっくりに is simply not a word; it's ゆっくり or ゆっくりと.
ゆっくりとドアが開いた。
yukkuri to doa ga aita
The door opened slowly.
Position: hug the verb
A manner adverb belongs immediately before the verb it modifies — Japanese is head-final, so the coloring word comes first. You can front a manner adverb for emphasis, but the safe, natural default is to keep it next to its verb. Placing it after the verb (English-style) is ungrammatical; the full story is on Adverb Position and Scope.
彼女は静かにドアを閉めた。
kanojo wa shizuka ni doa o shimeta
She quietly closed the door.
Common mistakes
Mistake 1 — Forcing に onto a lexical/mimetic adverb. ゆっくり, しっかり, はっきり take と (or nothing), never に. The に is reserved for na-adjective-derived adverbs.
❌ ゆっくりに話してください。
Wrong — ゆっくり is a lexical adverb; it takes と or stands bare. There is no ゆっくりに.
✅ ゆっくり話してください。
yukkuri hanashite kudasai
Please speak slowly.
Mistake 2 — Stranding the adverb after the verb (English order). The manner adverb precedes its verb; it cannot trail behind it.
❌ 彼はコーヒーを飲んだゆっくり。
Wrong — the adverb must come before the verb, not after it. Japanese is head-final.
✅ 彼はゆっくりコーヒーを飲んだ。
kare wa yukkuri kōhī o nonda
He drank his coffee slowly.
Mistake 3 — Confusing わざと (on purpose) with わざわざ (going out of one's way). They point in opposite social directions — intent-to-affect vs. taking-the-trouble.
❌ 友達がわざと空港まで送ってくれた。
Wrong — this accuses a kind favor of being deliberate sabotage; you mean わざわざ.
✅ 友達がわざわざ空港まで送ってくれた。
tomodachi ga wazawaza kūkō made okutte kureta
My friend went out of their way to drive me to the airport.
Mistake 4 — Using 早く (early) for 速く (fast), or vice versa. Both are read hayaku, but 速い is about speed and 早い is about time (earliness).
❌ もっと早く走れ！
Off for 'run faster' — 早く is about being early in time; speed is 速く.
✅ もっと速く走れ！
motto hayaku hashire
Run faster!
Key takeaways
- Manner adverbs answer "in what way?" and sit right before the verb.
- They come from two sources: productive derived forms (速く, 丁寧に) and a lexical/mimetic stock (ゆっくり, ちゃんと, わざと).
- に is for na-adjective-derived adverbs; mimetic/lexical adverbs take と or nothing — never ×ゆっくりに.
- ちゃんと / きちんと / しっかり are mimetic in origin and open the door to the onomatopoeia system.
- Watch two lookalike traps: わざと ("on purpose") vs. わざわざ ("going out of one's way"), and 速く (fast) vs. 早く (early).
Now practice Japanese
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Start learning Japanese→Related Topics
- Forming Adverbs: 〜く and 〜にN4 — The productive rule that turns any adjective into an adverb — i-adjectives swap 〜い for 〜く (早い→早く), na-adjectives add 〜に (静か→静かに) — why the split is a direct reflex of adjective class, the irregular いい→よく, and how these same forms feed 〜くなる / 〜になる 'become.'
- 〜そうに / 〜げに: Adverbial Nuance of AppearanceN3 — How to turn an appearance judgment into a manner adverb — 嬉しそうに笑う 'smile happily', 自信なさそうに答える 'answer unsurely', and the bookish 満足げに頷く 'nod with a satisfied air'.
- Onomatopoeia: An IntroductionN4 — Japanese mimetic words (擬音語・擬態語) are a huge, load-bearing adverb class — hundreds of everyday words that paint sounds, states, textures, and feelings — and this page shows why they are core vocabulary, not comic-book decoration, and how they attach to verbs with と, する, or だ.