IPA: /ˈhaɪdˌbaʊnd/
KK: /haɪdˌbaʊnd/
Describing someone or something that is very rigid, narrow-minded, or unwilling to change their opinions or ideas.
His hidebound views on education made it difficult for him to accept new teaching methods.
Hidebound is formed from "hide" (from Old English "hīd", meaning skin or hide) and "bound" (from Old English "bund", meaning tied or bound). The term originally described someone who is rigidly tied to traditional ways, much like a hide that is bound tightly.
Think of someone whose ideas are 'tied' ('bound') to old 'skins' ('hide') — that's why hidebound means being stuck in old ways.