不够辣。

You can use this phrase as a complete sentence. If a waiter asks how the food is, just say 不够辣. You can also add it to the end of a description. For example, 这个菜很好吃，但是不够辣. It is like adding a 'but' to a compliment. Use it when you feel the 'heat' is missing from the party.

Use this at restaurants when the 'extra spicy' version feels like a mild salsa. It is great when eating with friends who know you love heat. Use it when cooking at home to tell your partner to add more chili. It is a common phrase at street food stalls. It shows you are a serious eater who can handle the fire.

Do not use this if someone worked hard on a delicate meal. In very formal banquets, complaining about the spice might seem rude. Avoid saying it if the dish isn't supposed to be spicy. You wouldn't say it about a bowl of plain white rice. Also, don't use it to describe someone's personality unless you're joking. It is almost always about food.

China has a massive 'chili culture' in provinces like Sichuan and Hunan. In these regions, being able to eat spicy food is a point of pride. If you say 不够辣 in Chengdu, the chef might take it as a personal challenge. It is a way to bridge the gap between 'tourist spicy' and 'local spicy'. Many restaurants tone down the heat for foreigners, so this phrase is your secret weapon.

If it is really bland, say 一点都不辣 (not spicy at all). If you want to be polite, add 我觉得 (I feel) at the start. You can also say 还可以再辣一点 (It could be a bit spicier). If you are sweating but want more, say 还不够辣！. This shows you are a true spice warrior. Pair it with a cold beer for the full experience.