bitter

Having an acrid taste (usually from a basic substance).

The coffee tasted bitter.

Long after his cigar burnt bitter, he sat with eyes fixed on the blaze. When the flames at last began to flicker and subside, his lids fluttered, then drooped; but he had lost all reckoning of time when he opened them again to find Miss Erroll in furs and ball-gown kneeling on the hearth[…].

Harsh, piercing, acerbic or stinging.

It was at the end of February, […] when the world was cold, and a bitter wind howled down the moors […].

Hateful or hostile.

They're bitter enemies.

Tottenham have not won in the Premier League at Emirates Stadium for 12 years, with Arsenal losing just one of their last 29 home league games against their bitter rivals.

Cynical and resentful.

I've been bitter ever since that defeat.

To an intense or severe degree; bitterly.

A dynamic personality in the outfit, he met his death in the bitter-fought engagements in Venafro.

After that bitter-spoken warning, talk ceased outside […].

A liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic.

Thus I begin: "All is not gold that glitters, "Pleasure seems sweet, but proves a glass of bitters.

A type of beer heavily flavored with hops.

A turn of a cable about the bitts.