Imbitter

• (v. t.) To make bitter; hence, to make distressing or more distressing; to make sad, morose, sour, or malignant.
Found on http://thinkexist.com/dictionary/meaning/imbitter/

Imbitter

Im·bit'ter transitive verb [ imperfect & past participle Imbittered ; present participle & verbal noun Imbittering .] [ Prefix im- in + bitter . Confer Embitter .] [ Written also embitter .] To make bitter; ...
Found on http://www.encyclo.co.uk/webster/I/11
No exact match found