'Bitterness' in the Bible

for in the gall of bitterness, and bond of unrighteousness, I perceive thee being.'

Whose mouth is full of cursing and bitterness.

Let all bitterness, and wrath, and anger, and clamour, and evil-speaking, be put away from you, with all malice,

looking diligently over lest any one be failing of the grace of God, lest any root of bitterness springing up may give trouble, and through this many may be defiled;