4 adjectives to describe bitterest

Angostura [additive for alcoholic beverages], aromatic bitters.

Bitterness N. bitterness, acridness^, acridity, acrimony; caustic, alkali; acerbity; gall, wormwood; bitters, astringent bitters.

Out of her fruit she annually conserved miracles of flavor and transparence,great plums like those in Aladdin's garden, of shining topaz,peaches tinged with the odorous bitter of their pits, and clear as amber,crimson crabs floating in their own ruby sirup, or transmuted into jelly crystal clear, yet breaking with a grain,and jelly from the acid currants to garnish her dinner-table or refresh the fevered lips of a sick neighbor.

"'You look,' said he, 'like one who would snatch at a draught of sweet poison, and spurn wholesome bitters with disgust.'

4 adjectives to describe  bitterest