How did Okonkwo's father lead to his downfall?

Okonkwo thought his father Unoka was a shameful man because he was lazy, effeminate, a large debtor, drunkard, and a poor farmer. His father held no titles and was thus called an agbala. Unoka was also not a warrior, preferring instead to play the Flute. He was not well respected in any of the villages.

Because of this, Okonkwo was ashamed of his father, and did not wish to become like him. He did his best to flee from the shadow of his father.