tn The idiom “to harden the neck” (מַקְשֶׁה־עֹרֶף, maqsheh-’oref) is the idea of resisting the rebukes and persisting in obstinacy (e.g., Exod 32:9). The opposite of a “stiff neck” would be the bending back, i.e., submission.
2
tn The Hebrew construction is אִישׁ תּוֹכָחוֹת (’ish tokhakhot, “a man of rebukes”), meaning “a man who has (or receives) many rebukes.” This describes a person who is deserving of punishment and who has been given many warnings. The text says, then, “a man of rebukes hardening himself.”
3
sn The stubborn person refuses to listen; he will suddenly be destroyed when the calamity strikes (e.g., Prov 6:15; 13:18; 15:10).