good idea

You can use it as a short answer by itself. If a friend says, "Let’s get pizza," you just say, "Good idea!" You can also put it in a full sentence. For example, "That is a good idea." It works like a verbal high-five for someone's brain.

Use it when you are happy with a plan. Use it at work when a coworker solves a problem. Use it at a restaurant when a friend suggests sharing dessert. It is perfect for texting when you want to agree quickly without typing a long message. It makes people feel clever and appreciated.

Do not use it if you actually disagree. It can sound sarcastic if your voice is flat or mean. If someone suggests something dangerous, like jumping off a roof, saying "good idea" is a bad move! Also, in very high-level legal documents, people might use more formal words like "advisable."

In English-speaking cultures, being positive is a big part of social bonding. We love to encourage each other's creativity. Saying good idea is a way to build teamwork. It started as a simple description but became a standard polite response over many decades. It is one of the first things children learn to say to be helpful.

You can make it stronger by adding words. Try saying "Great idea!" or "Excellent idea!" if you really love the plan. If you want to be more casual, you can just say, "Good call." If you are in a professional meeting, you might say, "That's a solid idea." All of these keep the same friendly energy.