Fluent
adj. able to speak and/or write easily, clearly
Flagrant
adj. Glaringly bad ; outrageous
Flux
n. State of continual change or movement
Foible
n. A minor weakness in character
Fracas
n. A loud quarrel
Frivolous
adj. trivial; silly
Futile
adj. useless
Gaff
n. Large hook
Gait
n. Manner of walking
Gambit
n. An opening maneuver of action one used to gain advantage
Gape
v. To stare at with an open mouth
Garble
v. To distort
Genealogy
n. Family history
Genesis
n. Beginning; origin
Ghastly
adj. horrible; frightful