fecund(adj.)
fertile, fruitful
feign(v.)
to fake or pretend to
feral(adj.)
savage, wild, untamed
fetter(v.)
to restrain, chain, tie
fey(adj.)
magical
fickle(adj.)
characterized by changeableness, whimsical
figurative(adj.)
symbolic
firmament(n.)
the sky, the heavens
flabbergasted(adj.)
astounded, stupefied
flaccid(adj.)
limp
flattery(n.)
compliments, sycophancy
flout(v.)
to scorn, ignore, show contempt for
fluctuate(v.)
to vary irregularly
flux(n.)
a state of constant change or a flow
forage(v.)
to rummage, scavenge, graze for food
forestall(v.)
to delay, impede
forlorn(adj.)
lonely, hopeless
formidable(adj.)
arousing fear or alarm
forsake(v.)
to abandon, forget
fortify(v.)
to strengthen