'Bitterness' in the Bible

For I see that you are provoked by bitterness and bound by sin.”

“Their mouth is full of cursing and bitterness.”

Let all bitterness and wrath and anger and clamor [perpetual animosity, resentment, strife, fault-finding] and slander be put away from you, along with every kind of malice [all spitefulness, verbal abuse, malevolence].

See to it that no one falls short of God’s grace; that no root of resentment springs up and causes trouble, and by it many be defiled;