extreneous
not essential
facetious
humorous
facilitate
to make less difficult
fallacious
based on a false idea or fact; misleading
fatuous
foolishly self-satisfied
fawning
seeking favor by flattering
felicitous
suitably expressed; appropriate; well chosen
flag
to droop; grow weak
fledgling
beginner; novice; inexperienced; immature
fetter *
to confine; bind
flout
to treat scornfully
foment
to incite; arouse
forestall
to prevent; delay
formidable
menacing; threatening
frugality
thrift