proud, arrogant: a person or nation puffed up above its rightful place
This word is always an accusation. English "proud" can be warm and approving, as when a parent is proud of a child, but this Hebrew word never carries that good sense. It only ever names the wrong kind of self-importance: someone who has lifted himself up above the place that belongs to him.
The picture underneath the word is physical. Its root describes water swelling, or a plant shooting up, something rising higher than it should. To be "proud" in this sense is to rear up like a wave climbing over its own bounds. That image is why the word can be aimed not only at arrogant people but at whole nations and their monuments, cedars and towers and ships that stand tall and are due to be brought down.
The same root gives Hebrew a set of nouns (such as גָּאוֹן) that can point either way: they name God's rightful majesty when he is exalted, and human arrogance when a person is. This adjective, by contrast, is fixed on the bad side. It never describes God. That is the heart of it: God alone is rightly high, so a person or people who exalt themselves have stepped into a place that is not theirs, and the Bible uses this word to mark them for reversal, from the day of judgment in the prophets, to God bringing the proud low in the book of Job, to the psalmists crying out against proud oppressors.
Disputed
Whether Isaiah 2:12 uses the word in a physical "lofty, towering" sense distinct from the moral "arrogant" sense (older lexical treatment), or whether it is morally freighted there as everywhere else.
- majorityThe word is morally freighted in all its occurrences, including Isaiah 2:12; there is no separate merely-physical sense.; Hans Wildberger, Isaiah 1-12 (Continental Commentary), on Isa 2:12; H. G. M. Williamson, Isaiah 1-5 (ICC), on Isa 2:12
- minorityIsaiah 2:12 carries a physical "lofty" sense, distinct from the moral "arrogant" sense seen in Jeremiah 48:29.; BDB (Brown-Driver-Briggs), s.v. גֵּאֶה