noun
a person, especially a child, who is extremely difficult to control or manage
adjective
used to describe someone or something that causes fear or terror
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The child was known to be a holy terror in the classroom, disrupting lessons and causing chaos.
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Watch out for that little boy, he's a holy terror when he's in a mischievous mood.
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She's a holy terror when she's had too much coffee, always buzzing around and getting into everyone's business.
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The new boss was a holy terror when it came to enforcing deadlines and quality standards.