façade
(n.) the wall of a building
(n.) a deceptive appearance or attitude
fallacious
incorrect, misleading
fastidious
meticulous, demanding, having high and often unattainable standards
fecund
fruitful, fertile
fervent
ardent, passionate
fetter
to chain, restrain
figurative
symbolic
flabbergasted
astouned
flaccid
not firm, limp
florid
flowery, ornate
foil
to thwart, frustrate, defeat
forage
to graze, rummage for food
fortuitous
happening by chance, often lucky or fortunate
forbearance
patience, toleration
fortitude
strength
frugal
thrifty, economical
frivolous
of little importance, trifling
furtive
secretive