FALLOW
dormant; unused
FANATICAL
acting excessively enthusiastic; filled with extreme unquestioned devotion
FATUOUS
stupid; foolishly self-satisfied
FAWN
to grovel
FECUND
fertile; fruitful; productive
FERVID
intensely emotional; feverish
FETID
foul-smelling; putrid
FLAG
to decline in vigor, strength, or interest
FLORID
excessively decorated or embellished
FOMENT
to arouse or incite
FORD
to cross a body of water by wading
FORESTALL
to prevent or delay; anticipate
FORTUITOUS
happening by chance; fortunate
FRACTIOUS
unruly; rebellious
FRENETIC
frantic; frenzied
FRUGALITY
tending to be thrifty or cheap
FURTIVE
secret, stealthy