Answer: bitterest

AnswerCrossword Clue
BITTERESTMost cynical
BITTERESTMost acerbic
BITTERESTMost sour-tasting
bitterest(of a conflict, argument, or opponent) Full of anger and acrimony
bitterestHaving a sharp, pungent taste or smell; not sweet
bitterest(of wind, cold, or weather) Intensely cold
bitterest(of chocolate) Dark and unsweetened
bitterest(often used for emphasis) Painful or unpleasant to accept or contemplate
bitterest(of people or their feelings or behavior) Angry, hurt, or resentful because of one's bad experiences or a sense of unjust treatment
bitterestBITTER, having a disagreeable taste