"Imbittering" is a word in ENGLISH

To sour; to imbitter; to irritate.

To sour; to imbitter.

To make bitter or sad. See Imbitter.

To taint or impregnate with bitterness, malice, or hatred; to imbue as with venom; to imbitter.

To render more violent or bitter; to irriate; to exasperate; to imbitter, as passions or disease.

To make grievous, or more grievous or malignant; to aggravate; to imbitter; as, to exasperate enmity.

Exasperated; imbittered.

A form of the prefix in- not, and in- in. See In-. Im- also occurs in composition with some words …

To make bitter; hence, to make distressing or more distressing; to make sad, morose, sour, or malignant.

of Imbitter

One who, or that which, imbitters.

The act of imbittering; bitter feeling; embitterment.

To poison; to imbitter; to impair.