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English definition of “hard/tough as nails”

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hard/tough as nails

not feeling or showing any emotions such as sympathy, fear, or worry
Translations of “hard/tough as nails”
in Chinese (Traditional) 冷酷無情的,鐵石心腸的…
in Chinese (Simplified) 冷酷无情的,铁石心肠的…
(Definition of hard/tough as nails from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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