fervent -- characterized by intense emotion "A fervent desire to change society"
fervour -- feelings of great warmth and intensty
foibles -- idiosyncrasies
foolhardy -- defiant disregard for danger or consequences
forage -- look for food
fortitude
frugal
facsimile -- exact copy
furlough -- temporary leave or absence from military, grant leave
(The prisoner was granted furlough to meet his ailing mother)
