Final answer:
Cerdic is not trustworthy in the book 'Crispin: The Cross of Lead' as he is shown to be deceitful and manipulative.
Step-by-step explanation:
In the book 'Crispin: The Cross of Lead,' Cerdic is not portrayed as trustworthy. Throughout the story, Cerdic is shown to be deceitful and manipulative. For example, he betrays Crispin by working with the villains and using Crispin's trust to gain information. Cerdic's actions demonstrate that he cannot be relied upon and that he is willing to sacrifice others for his own gain.