Please help!! This is very easy!

Answer:
Friendly
Prefix A: Fee
Root A: Friend
Suffix A: "not harmful" or "suitable for"
Definition A: kind and pleasant.
Archenemy
Prefix A: Arch
Root A: Arch
Suffix A: Arch
Definition A: A person who is extremely hostile or opposed to someone or something.
I don't really know the first three are kinda weird but these were the answers i got.
Answer:
Friendly
Prefix: Friendly
Root: Friend
Suffix: Not harmful
Definition: Nice, kind, trustworthy
Explanation:
I don't know archenemy but I hope you find the answers!