The sentence shows that Adam began to feel uncomfortable and anxious.
Adam is anxious for a particular activity to come to an end, as performing it makes him uncomfortable. For that reason, he wants to finish it as soon as possible.
This is a way of characterizing Adam indirectly, as it shows how uncomfortable he is with negative feelings.
More information about indirect characterization is at the link:
https://brainly.com/question/12003614