marar (Hebrew #4843)
properly, to trickle (see 4752); but used only as a denominative from 4751; to be (causatively, make) bitter (literally or figuratively)
KJV usage: (be, be in, deal, have, make) bitter(-ly, - ness), be moved with choler, (be, have sorely, it) grieved(-eth), provoke, vex.
Pronounce: maw-rar'
Origin: a primitive root