useless trivia: What Word Means: Sleazy?

Questions

"I count him braver who overcomes his ---------- than him who conquers his enemies; for the hardest victory is the victory over self."-Aristotle?

"If the facts don't fit the ----------, change the facts."- Albert Einstein (1879-1955)?

"I destroy my enemy when I make him my ---------."- Abraham Lincoln (1809-1865)?

"If the grass is ----------- in the other fellow's yard - let him worry about cutting it."- Fred Allen?

"If thine enemy wrong thee, buy each of his children a -----------."- Chinese Proverb?