﴿ وَمَكَرُوا۟ مَكْرًۭا كُبَّارًۭا ﴾

“and who have devised a most awesome blasphemy [against Thee],”

The opponents of Noah devised many great schemes against him. One of these was to spread it about that Noah was against their great ones of old, viz., Wadd, Suwa‘, Yauq, Yaghuth and Nasr. All of them had been of great piety in ancient times. Gradually they became sanctified and ultimately people started worshipping them. It was easy to turn the people against Noah in the name of these men. So, they made Noah’s mission look dubious to the people by saying that he was treading a new path, straying from the path of their revered forebears.