The phrase "imperfect man" refers to a person who has flaws or makes mistakes. It suggests that nobody is perfect and everyone has areas where they could improve or be better. Full definition
It is a story of three imperfect men who faced adversity and emerged with their honor intact. (bookbrowse.com)
It will carry with it the same imperfections any religion is capable of producing because imperfect men are involved. (religion.blogs.cnn.com)
Read the Old Testament, God's people are human - even though they were his people it is filled with stories of imperfect men doing bad things, yet the point is always how God intervenes to bring out the good. (religion.blogs.cnn.com)