Definition of monstruous in US English:

monstruous

adjective

rare
  • Monstrous.

Origin

Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From Middle French monstrueux and its etymon classical Latin mōnstruōsus, variant of mōnstrōsus.

Pronunciation

monstruous

/ˈmɒnstrʊəs/