adj. 25B6; adjective BITTER, spiteful, hateful, resentful, acrimonious, malicious, malevolent, hostile, venomous, vindictive, baleful, vitriolic, vengeful, pernicious, mean, nasty; informal bitchy, catty.
amicable.
RANCOROUS
Meaning of RANCOROUS in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012