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

• unargumentative
• unarm
• unarmed
• unarmored
• unarmoured
• unarticulate
• unarticulated
• unartistic
• unary
• unary operation
• unascertainable
• unascribable
• unashamed
• unashamedly
• unasked
• unaspiring
• unassailable
• unassailably
• unassertive
• unassertively
• unassertiveness
• unassignable
• unassigned
• unassisted
• unassuming