駄目
だめ
dame
= no good / not allowed / useless
駄目 (dame) is one of the most versatile words in everyday Japanese, capable of shutting down a request, describing something broken, or expressing that a situation is beyond saving — all with a single sharp syllable. Its directness makes it a staple of daily conversation, parenting, and workplace feedback alike.
駄目 functions as a na-adjective and covers three distinct but related meanings that learners must keep separate.
1. Prohibition (not allowed / you must not) — This is the most common use in spoken Japanese. 〜てはだめ or the contracted 〜ちゃだめ tells someone an action is forbidden or strongly discouraged. A parent saying 走っちゃだめ! to a child running near a road is using this sense.
2. Uselessness or failure (no good / broken / hopeless) — When something stops working, loses value, or is beyond repair, 駄目 describes it. このパソコンはもうだめだ means the computer is done for. This sense can apply to people, plans, or objects.
3. Impossibility or refusal (it won’t work / I can’t) — だめでした is a polite way to report that an attempt failed or was rejected. In business contexts this reports an unsuccessful outcome without assigning blame.
The word accepts the standard na-adjective conjugations: だめな理由 (a reason it’s no good), だめになる (to become ruined), and だめにする (to ruin something).
Politeness levels: だめだ is plain form and sounds blunt — fine among friends or family but too abrupt in most workplace situations. だめです adds a minimal level of formality. For business refusals, 難しいです or 対応いたしかねます are far safer. Using だめです to a customer or senior colleague can come across as curt.
派生語 — ダメ出し (dame-dashi): This compound, literally “pointing out the dame points,” means giving critical feedback or calling out flaws. It is widely used in creative industries, sports coaching, and casual conversations: 監督にダメ出しをされた (the director gave me notes). The nuance is constructive criticism rather than outright rejection.
Script choice: In handwritten or typed casual messages, hiragana だめ feels soft and conversational. Katakana ダメ adds visual emphasis — it can feel sharper or more emphatic, similar to italics in English. Kanji 駄目 appears more often in formal writing, literature, or when the etymological weight is intentional.
The kanji 駄目 combines two characters with unexpected origins. 駄 (da) originally depicted a horse carrying a load — specifically a pack horse used for menial transport. The character carried the sense of something lowly, surplus, or of poor quality. 目 (me) in this compound does not mean “eye” in the everyday sense; it refers to the intersections and enclosed spaces on a go board (囲碁). In the board game go, capturing territory requires surrounding empty intersections called 目. A 駄目 was a neutral intersection that neither player could claim and that contributed nothing to either side’s score — a wasted, pointless space. Over centuries the term migrated from go terminology into general speech, retaining the core idea of something that serves no purpose or cannot succeed.
Everyday use
廊下を走っちゃだめだよ。
Rōka wo hashicha dame da yo.
You’re not supposed to run in the hallway.
Casual / Social Media
もうダメ、このスマホ全然充電されない。
Mō dame, kono sumaho zenzen jūden sarenai.
I give up — this phone just won’t charge at all.
Formal / Cultural context
先方に確認しましたが、今週の納期はだめでした。
Senpō ni kakunin shimashita ga, konshū no nōki wa dame deshita.
I checked with the other party, but this week’s deadline didn’t work out.
In Japanese communication, outright refusals are often softened through indirection — 「ちょっと…」, 「難しいですね」, or a sharp intake of breath can all signal “no” without the word itself appearing. 駄目 sits at the direct end of this spectrum. Because it states plainly that something is not acceptable or has failed, it carries a certain social weight that Japanese speakers calibrate carefully. In close relationships — family, longtime friends, teammates — 「だめ」 is unremarkable and efficient. In hierarchical or customer-facing settings, reaching for 駄目 without softening phrases is considered blunt and can damage rapport.
The word’s go board origin is culturally telling. Go (囲碁) has been a pastime of Japanese intellectuals and strategists for centuries, and its vocabulary has seeped into everyday language in ways that native speakers rarely notice. Other go-derived expressions include 「布石を打つ」 (to lay groundwork) and 「定石」 (established method). 駄目 is perhaps the most democratized of these, having traveled completely out of the game and into the mouths of children, commuters, and novelists alike.
In parenting and education, 「だめ!」 functions as a universal stop signal for young children, equivalent to “no!” or “don’t!” in English. Child development researchers in Japan have noted that parents and educators sometimes favor 「〜してはいけません」 in formal settings to model more complete grammatical reasoning rather than the absolute-sounding single word, reflecting a broader cultural awareness of how 駄目’s bluntness shapes the message.