A good instance can be expressed by using similar words like an appropriate or ideal example. It can also be referred to as a suitable or fitting representation of a particular scenario. A convincing or compelling instance is one that can effectively support an argument or position. A valid instance refers to something that is supported by fact or evidence, while a powerful instance denotes something that has a strong impact or influence. An excellent or exceptional instance is one that stands out due to its exceptional quality or performance. A positive instance, on the other hand, denotes one that has a favorable or beneficial outcome.