How to Say "holy terror" in Spanish
The Spanish word for “holy terror” is “terror” — C1 level.
English → SpanishC1
nounC1informal
a very naughty child

Examples
Mi sobrino es un terror; rompió dos jarrones esta mañana.
My nephew is a menace/holy terror; he broke two vases this morning.
Ese perro es un terror, siempre está ladrando a los carteros.
That dog is a terror, it's always barking at the mail carriers.
Used with 'Ser'
When 'terror' refers to a person or animal, it is used with the verb 'ser' (to be) to describe their nature: 'Él es un terror' (He is a terror).
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