dastard
A malicious coward; a dishonorable sneak.
I thought ye would never have given out these arms till you had recovered your ancient freedom: but you are all recreants and dastards, and delight to live in slavery to the nobility.
Where it comes from
From Middle English dastard (“a dullard”), most likely formed from *dast, a base derived from Old Norse dæstr (“exhausted, breathless”) + -ard. Compare Icelandic dasaður (“exhausted”), dialectal Swedish däst (“weary”), Middle Dutch dasaert, daasaardt (“a fool”), English dazed (“stupefied”).
Adapted from the Wiktionary entry dastard (CC BY-SA 4.0).