needless to say, it goes without saying; better left unsaid, unspoken

💡 Nuance & Usage: Can have two main nuances: 1. It's so obvious that it doesn't need to be said. 2. It's better not to say it, perhaps because it's rude, harmful, or spoils the mood. 文脈によって「言うまでもない」という意味と、「言わない方がましだ」という二つの意味を持つ。