The dinner was exceedingly delicious, and we all enjoyed it very much.

exceedingly 是副词，由动词 exceed（超过）加上后缀 -ing 和 -ly 构成。exceed 表示"超过、超出"，-ing 将动词变为现在分词或形容词，-ly 将形容词变为副词。exceedingly 的意思是"非常、极其"，用来强调程度很高。