わけにはいかない

わけにはいかない expresses a duty, obligation, or practical impossibility due to circumstances. It conveys that, despite any desire or possibility, one cannot do what is being considered because of external constraints (social expectations, responsibilities, consequences). It often sounds formal or assertive, and contrasts with a more casual inability. Typical contexts include work, responsibilities, or important reasons that prevent a person from taking a certain action. Examples: 行くわけにはいかない (I can’t go, because of [my obligations]); 忙しくて遊ぶわけにはいかない (I can’t go out to play because I’m busy).