Is livelier a synonym for thrilled?

Not exactly. While both "livelier" and "thrilled" can describe positive feelings, they have different nuances:

* Livelier implies more energy and animation. It describes a state of being more active, spirited, and excited. Think of a lively party or a lively conversation.

* Thrilled implies a sense of excitement and joy. It suggests a heightened state of happiness and anticipation. Think of being thrilled to win a prize or to see a loved one.

So, while both words can describe positive emotions, "livelier" focuses on energy and activity, while "thrilled" focuses on happiness and excitement.

Here's an example:

* You might be thrilled to win the lottery, but you might be livelier at a dance party.