A Serpent Puzzle

Listen from:
In each chapter mentioned you will find an adjective describing a serpent, starting with the letter given, and having as many letters as there are dashes. Print the missing letters on the dashes. Who is the serpent? (Rev. 12:9).
S _ _ _ _ _ _ (Genesis 3)
F _ _ _ _ (Numbers 21)
B _ _ _ _ _ (2 Kings 18)
C _ _ _ _ _ _ (Job 26)
W _ _ _ (Matthew 10)
ML-12/03/2000