noun
a tough or uncompromising person
adjective
tough or uncompromising in behavior or attitude
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The new manager is known to be a hard-ass when it comes to enforcing company policies.
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Don't mess with Coach Johnson, he's a real hard-ass when it comes to discipline.
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My dad can be such a hard-ass about curfew sometimes.
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She may seem like a hard-ass on the outside, but she's actually very caring and compassionate.