Attentively vs Solemnly - What's the difference?

As adverbs the difference between attentively and solemnly

is that attentively is in an attentive manner while solemnly is in a solemn manner.

(en adverb)

In an attentive manner.

* 1908:

`It's a very clean cut,' said the Rat, examining it again attentively .

When Major saw that they had all made themselves comfortable and were waiting attentively , he cleared his throat and began

* tentatively

(en adverb)

In a solemn manner.

* (l), (l)