Rancorous
Pronunciation : Ran"cor*ous
Part of Speech : a.
Etymology : [OF. rancuros.]
Definition : Defn: Full of rancor; evincing, or caused by, rancor; deeply malignant; implacably spiteful or malicious; intensely virulent. So flamed his eyes with rage and rancorous ire. Spenser.
Source : Webster's Unabridged Dictionary, 1913