About English 的simple question

其實hardest和hard一樣，要視乎句子而作解釋：
如：Diamond is the hardest mineral.(鑽石是最堅硬的礦物）
I was the hardest time in my life when my father was gone.（當我父親離世的時候，這是我人生最艱難的時刻）
希望幫到你！

You misunderstood my question.

first is hard, then is harder, last is hardest