I'm not a teacher.
[QUOTE=emsr2d2;616517]I can't think of any way of saying it as an adjective. As far as I know, it can only be used as a verb or a noun:
You have to know that even a man of moderate means takes advantage of the the opportunity to make use of the key word “fasting” as an adjective or an adverb.
What is Permitted for a Fasting Person?
So I will reward the fasting person for it and the reward of good deeds is multiplied ten times.
fasting (adv) = on an empty stomach
If hydrochloric acid is taken fasting without the addition of food to digest, it will cause a warm to burning sensation in the stomach.