hard as nails
堅強無比;無情無心
口語·形容人堅強或冷酷
英文釋義
tough, unfeeling, or unsympathetic
例句
My grandfather was hard as nails; he never showed emotion, even at funerals.
典故來源
源自19世紀英國,釘子象征堅硬,比喻人冷酷無情或身體極其強壯。