What does いけない mean?
いけない is a Japanese noun meaning “must not do, bad, wrong” in English. It can also be translated as “must not (do, be), useless, hopeless” depending on context. It is written as いけない in hiragana, and ikenai in romaji. This word is part of JLPT N3 vocabulary.
Example sentences
彼本人は好人物なんだが、その取り巻きがどうもいけないね。
I really like him, but not his circle of friends.
道に迷うといけないから、地図をもって行きなさい。
Take a map with you in case you get lost.