Famished is a word for extremely hungry that starts with the letter F.
Pleading!
famished
malnourishedFamished Hungry Unnourished
Megalomanic
that would be patience.
Ravenous, voracious
Most dictionaries will give you a selection, such as plead, ask, importune, solicit,
Phenomanal
I was extremely hungry on our school trip to the beautiful lands of devon as it was the longest three hours ever-however we had a delicous lunch when we arrived!
Extremely fine, extremely good, superbly well, fantastically great.
bear caved.