This word occurs only twice in the KJV: in Deuteronomy 2:30, when God made the king of Heshbon 'obstinate' so that he refused Israel passage through his land, and so brought about the invasion and occupation of his country; and in Isaiah 48:4, where God calls His people Israel 'obstinate' because they refused to acknowledge Him, and attributed all their success to idols.

The NIV substitutes 'stubborn', which has the same meaning. To be 'hard' or 'hardhearted' conveys the same idea. In Deuteronomy 9:27 Moses pleads with God to "overlook the stubbornness of this people" whom He had delivered from Egypt, and the writer to the Hebrews pleads with us: "do not harden your hearts" against God (in Hebrews 4:7), as a whole generation of Israel did, and as the result were excluded from entering the promised land.

Other Hebrew words are translated 'stubborn', for example:

"If a man has a stubborn and rebellious son who does not obey his father and mother and will not listen to them when they discipline him, his father and mother shall take hold of him and bring him to the elders at the gate of his town.…" (Deuteronomy 21:18-19).

Obedience
Obstinate
Offering
Olive Tree
Omnipotent
Omniscient