駄目な（だめな、damena）
- useless/no good

The Japanese word 駄目な (pronounced だめな, *damena*) means "useless," "no good," "hopeless," "unacceptable," or "not allowed." It is an adjective that describes something or someone that is not functioning properly, is not suitable, or is forbidden. It expresses disapproval or a lack of permission. 駄目な is often used to express a negative judgment or to refuse something.

⚫︎ それは駄目なことです。 Translation: That is a bad thing to do. ⚫︎ このパソコンはもう駄目だ。 Translation: This computer is no good anymore. ⚫︎ 駄目なものは駄目だ。 Translation: What is not allowed is not allowed. (or "No means no.")

⚫︎ You can use 駄目な when refusing a request or an offer. For example, if someone asks you to do something you don't want to do, you could say, それは駄目です。 (That's not acceptable.). ⚫︎ Use it when something is broken or malfunctioning. For instance, このペンはもう駄目だ。 (This pen is no good anymore.) indicates that the pen no longer works. ⚫︎ It is also used to express a negative judgement on behavior. If someone is doing something inappropriate, you might say それは駄目だよ。 (That's not good, you know.) ⚫︎ It's important to note the nuance. While 駄目な is generally negative, it can be used with a degree of informality depending on the context and the people involved.

⚫︎ 駄目な is typically written in hiragana as だめな. ⚫︎ The kanji for 駄目 is used in formal writing. ⚫︎ The kanji 駄目 is sometimes written as ダメ in katakana to show emphasis or a sense of informality. ⚫︎ There are no variations in the okurigana for this word.

⚫︎ 悪い (わるい - warui): bad ⚫︎ 良くない (よくない - yokunai): not good ⚫︎ いけない (ikenai): wrong, unacceptable ⚫︎ 不能な (ふのうな - funouna): impossible, incapable ⚫︎ 無効な (むこうな - mukouna): invalid, ineffective

⚫︎ 良い (よい - yoi): good ⚫︎ 大丈夫な (だいじょうぶな - daijoubuna): okay, alright ⚫︎ 有効な (ゆうこうな - yuukouna): valid, effective

宿題をしないのは駄目だよ。 ・Translation: It's not okay to not do your homework. ・Explanation: This sentence uses 駄目な to express disapproval of not doing homework.

この食べ物は駄目だ。腐っている。 ・Translation: This food is no good. It's rotten. ・Explanation: This sentence uses 駄目な to describe that the food is spoiled and cannot be consumed.

The origin of the word 駄目 is not fully agreed upon, but it's likely a combination of the kanji: ⚫︎ 駄 (da): meaning "worthless," "useless" ⚫︎ 目 (me): meaning "eye," but in this case, used as a suffix to mean "end" or "termination." Therefore, 駄目 literally suggests something that has reached its end or is considered useless.