Vulgar.
>https:// www.etymonline.com/word/satan
Old English Satan, from
Late Latin Satan (in Vulgate in Old Testament only),
from Greek Satanas,
from Hebrew satan "adversary, one who plots against another,"
from satan "to show enmity to, oppose, plot against,"
from root s-t-n "one who opposes, obstructs, or acts as an adversary."
In Septuagint (Greek) usually translated as 'diabolos "slanderer,"'
literally "one who throws (something) across" the path of another (see devil (n.)),
though epiboulos "plotter"' is used once.