Answer:
Blake describes wandering 'thro' each charter'd street'. ... In Blake's 'London' even the beauty and anarchy of nature are subjected to political control. The regular iambic rhythm continually exemplifies the unavoidable, imprisoning influence of society, which haunts not only nature, but the citizens of London.
Explanation:
I would say sorrowful due to the context, however difficult would also make sense. As it is referring to the fault as his downfall I would stick with 'sorrowful' as the answer.