1. With passionate fervour
   "a fierily opinionated book"
   - fervently, fervidly

See also: fiery

• fourth dimension
• Fourth Earl of Chesterfield
• Fourth Earl of Orford
• fourth estate
• Fourth Lateran Council
• Fourth of July
• fourth part
• fourth power
• fourth stomach
• fourth ventricle
• fourth-year
• fourthly
• fovea
• fovea centralis
• foveal vision
• fowl
• fowl cholera
• fowl pest
• fowl run
• fowler
• fowling piece
• fox
• fox grape
• fox hunter
• fox hunting