flagitious attack [flagitious = extremely brutal or cruel crimes; vicious; infamous]
flagrant boasting
flamboyant brilliancy
flaming zeal
flashing wit
flat denial
flattering aspect
flaunting insolence
flawless constitution
fleecy clouds
fleeting intimation
flickering conscience
flighty obstinacy
flimsy organization
flippant ease
floating blackness
florid oratory [florid = ornate; flowery]
flowery circumlocution
flowing imagery
fluctuating light
fluent sophist
fluffy indignation
fluid ideas
flushed embarrassment
fluttering laugh
focused attention
foggy notion
fond enthusiast
foolish frenzy
forbearing silence
forbidding air
forceful audacity
foregone conclusion
foremost opponent
forensic orator
forest stillness
forgotten graveyard
forlorn desolation
formal acquiescence
formidable barrier
formless jottings
formulated conclusions
fortified selfishness
fortuitous circumstance
foul calumny [calumny = maliciously lying to injure a reputation]
fragile form
fragmentary facts
fragrant reminiscence
frail craft
frank admiration