1)
What are the implications of "Am-K'shei-Oref"?
1.
Rashi: It implies that they are a stubborn nation - who turn the backs of their necks to those who rebuke them.
2.
Seforno: It implies that they are a stubborn nation, who refuse to turn round to listen to those who want to guide them on the right path. Consequently, there is no hope that they will do Teshuvah.
