deep, tender compassion: the gut-level mercy a parent feels toward a child
This is the warmest of the Hebrew words for mercy. It almost always appears in the plural, and it names compassion felt in the body, the visceral tenderness that wells up when you see someone you love in need or in trouble. The word is built from the same root as the word for a mother's womb, so its picture is the fierce, protective love a mother feels for the child she carried. That maternal image is the heart of the word: not a cool decision to be lenient, but a stirring of affection that moves a person to act.
Most often the Bible uses it of God. His compassion is the reason he forgives a rebellious people, gathers the scattered, and does not consume those who deserve judgment. Worshippers appeal to it directly, asking God to remember his mercies and to be moved on their behalf. Because the feeling is rooted in relationship, it carries a note of faithfulness: God's compassion is reliable, renewed every morning, not a passing mood.
The same word describes human tenderness too: a brother's heart breaking at the sight of his younger brother, a king granting mercy to captives, even the kindness a good person shows to an animal. When the Bible wants to say that someone has lost all such feeling, it speaks of compassion being shut off or withheld.
English has no single word that holds both the tenderness and the bodily, parental force of it. Translators reach for mercy, compassion, pity, and tender mercies, each catching part of it.