Definition of rancorousness in US English:

rancorousness

noun

  • Rancour; the state or condition of being rancorous.

Origin

Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From rancorous + -ness.

Pronunciation

rancorousness

/ˈraŋk(ə)rəsnəs/