Bitterness
来自Big Physics
Old English biter, of Germanic origin; related to Dutch and German bitter, and probably to bite.
wiktionary
From Middle English bitternesse, biternesse, from Old English biternes(“bitterness; grief”), equivalent to bitter + -ness.
etymonline
bitterness (n.)
Old English biternys "bitterness, grief;" see bitter + -ness. Figurative sense (of feelings, etc.) is attested earlier than literal sense (of taste), which will surprise no one who reads any amount of Anglo-Saxon literature.
