1. Naively or unreasonably optimistic
   "I found the article regarding earnings growth slightly Panglossian" 
2. Of or relating to the view that this is the best of all possible worlds

Encyclopedia: Panglossian

• participative
• participator
• participatory
• participial
• participle
• particle
• particle accelerator
• particle beam
• particle board
• particle detector
• particle physics
• particolored
• particolored buckeye
• particoloured
• particular
• Particular Baptist
• particular date
• particular proposition
• particularisation
• particularise
• particularised
• particularism
• particularist
• particularistic
• particularity