Possible Clues:

• Something must be denied by this philosopher
• 'Think nothing of it' sayer?
• Ultimate nonbeliever
• Pessimist turns up in greeting directory
• Believer that life is meaningless
• Pessimist flips in greeting a number of those in wine bar from Bordeaux
• One who rejects values
• One whose guiding philosophy is 'What does it matter?'
• Revolutionary in welcoming address to Directory believes life is meaningless
• One who rejects all religious and moral teaching