noun, plural mon·stros·i·ties.
- the state or character of being monstrous.
- a monster or something monstrous.
noun plural -ties
- an outrageous or ugly person or thing; monster
- the state or quality of being monstrous
n.1550s, “abnormality of growth,” from Late Latin monstrositas “strangeness,” from Latin monstrosus, a collateral form of monstruosus (cf. French monstruosité); see monster. Earlier form was monstruosity (c.1400). Sense of “quality of being monstrous” is first recorded 1650s. Meaning “a monster” is attested from 1640s.