bitterender

[ bit-er-en-der ]
/ ˈbɪt ərˈɛn dər /

noun

a person who persists until the bitter end without compromising or yielding; diehard.

Origin of bitterender

An Americanism dating back to 1840–50; bitter end + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019