Part 1.
ford
cross a river where it's shallow
forebear
a person from whom you are descended
foreboding
a feeling of evil to come
formal
characteristic of or befitting a person in authority
forsake
leave someone who needs or counts on you; leave in the lurch
fortitude
strength of mind that enables one to endure adversity
Part 2.
foster
promote the growth of
fracas
a noisy quarrel
fractious
easily irritated or annoyed
fraught
filled with or attended with
fray
a noisy fight
fresco
a mural done with watercolors on wet plaster
Part 3.
frieze
an ornament consisting of a horizontal sculptured band
frontier
a wilderness at the edge of a settled area of a country
fructify
become productive or fruitful
frustrate
hinder or prevent, as an effort, plan, or desire
fulminate
criticize severely
functionary
a worker who holds or is invested with an office
Part 4.
furnish
provide with objects or articles that make a room usable
gadfly
a persistently annoying person
gainsay
take exception to
gale
a strong wind moving 45-90 knots
garble
distort or make false by mutilation or addition
garish
tastelessly showy