to condemn in anger: to burn with indignation against someone, and to voice that anger as a denunciation or curse.
This word ties together two things English usually splits apart: a feeling and a verdict. It names hot, condemning anger, and in the same breath the act of speaking that anger against its target. So the God who "is indignant" with the wicked every day and the seer asked to "denounce" a nation are doing the one same thing with this single word.
Most often the anger belongs to God, and it is the settled, judicial kind rather than a flash of temper: a righteous fury against wrongdoing that can smolder for years, as when the angel asks how long the LORD will withhold mercy after seventy years of indignation. When people are the ones denouncing, the word carries the force of pronouncing someone condemned, which is why it stands beside the ordinary Hebrew verbs for cursing (קָבַב, אָרַר) in Balaam's refusal to curse Israel.
The same idea can be turned around so that a person or thing is on the receiving end: something may be "denounced," meaning marked out as under condemnation, like the short, cheating measure the LORD rejects. Whether the anger is felt, spoken, or received, the constant is a hostile displeasure that passes sentence.