This is the 697th most frequent French word.
dur
Hard; tough; harsh.
Here, 'dur' is used to describe the physical hardness of the metal.
Ce n'est pas facile de découper ce métal, il est vraiment dur.
It's not easy to cut this metal, it is really hard.
In this sentence, 'dur' is used metaphorically to describe a challenging situation.
Le temps était dur pour eux pendant cette période difficile.
Times were hard for them during this tough period.
Here, 'dur' denotes the physical firmness causing discomfort.