What is greek for bad?
Depending on which bad you mean.
Evil "bad": Malus
Ugly "bad": Kakos
What evidence is there that key figures influence the growth and development of the Greek civilization?
All human societies, of yesterday and of today, are influenced by strong leaders - for good and for bad. The Greek world had both good and bad, and mixed good and bad. Leaders give direction and encouragement, and these existed in Greece as well as today. The evidence for this lies in the achievements, advancements and backslidings in the Greek world at different times and locations.