Synonyms for Bitterness

Sharpness
absolute zero bitterness chill	coldness cool cryogenics	freezing point inclemency keenness	severity sharpness

Virulence
acerbity acidity acridity acrimony anger animosity asperity	astringency bad temper bile bitterness choler discontent gall	hard feelings mordancy poignancy rancor severity sharpness soreness	sourness spleen stridency stringency teeth violence virulence

Sadness
agony anguish bale bitterness bleeding heart broken heart	depression desolation despair distress extremity gloom	gloominess grief heartache heartbreak heavy heart infelicity	melancholia melancholy misery prostration sadness woe

Rancor
acrimony animosity animus antagonism antipathy	aversion bad blood bitterness disgust	enmity feud hard feelings hostility	malice rancor resentment vendetta