1. Not easy to believe
   - incredibly, implausibly, unbelievably

See also: improbable

• phthisis
• Phthorimaea
• Phthorimaea operculella
• phunk
• phwoah
• phwoar
• phycobilin
• phycocyanin
• phycoerythrin
• phycology
• Phycomycetes
• Phycomycetes group
• phycomycosis
• phylactery
• phyle
• phyletic
• Phyllidae
• phylliform
• phyllite
• Phyllitis
• Phyllitis scolopendrium
• Phyllium
• phyllo
• phylloclad
• Phyllocladaceae