难安抚的性质或状态
... imperturbability n. 沉着,冷静 implacability n. 难安抚的性质或状态,执拗,无情 imponderability n. 无重量性,极轻,无法测知的性质或状态 ...
不缓和;难以安抚;无情
brutality / ruthlessness
Three ships of the Royal Navy have been named HMS Implacable: