ra.khakh describes a heart becoming faint or responsive, and also appears of wounds softened with oil.

The attested uses chiefly concern the condition of the heart: it may be warned not to become faint in the face of threat, or be described as responsive and humbled before God. A separate occurrence describes wounds that had not been softened with oil; Psalm 55:22 contains a Qal perfect plural form, but the translation does not make its individual contribution clear.

1. A heart becoming faint under fear or distress · dominant

   In Deuteronomy 20:3, Isaiah 7:4, and Jeremiah 51:46, the Qal forms occur in warnings that the heart not “grow faint” amid battle, hostile anger, or alarming reports. In Job 23:16, the Hiphil perfect is in the statement that God “has made my heart faint” and that the Almighty has terrified the speaker.

   Deuteronomy 20:3Isaiah 7:4Jeremiah 51:46Job 23:16
2. A responsive heart expressed in humbling · common

   In 2 Chronicles 34:27 and 2 Kings 22:19, the Qal perfect occurs with a heart that is followed by humbling oneself, tearing garments, and weeping after hearing words concerning the place and its inhabitants. The APB renders the heart as “tender” in both verses.

   2 Chronicles 34:272 Kings 22:19
3. Softening in treatment; one unclear occurrence · rare

   In Isaiah 1:6, the Pual perfect describes wounds, bruises, and fresh wounds that “were not pressed out, nor bound up, nor softened with oil.” Psalm 55:22 has a Qal perfect plural form, but the supplied translation does not isolate how that form contributes within the verse.

   Isaiah 1:6Psalm 55:22

In the Anselm Project Bible: The APB presents the heart-related clauses as “tender” in 2 Chronicles 34:27 and 2 Kings 22:19, and as “grow faint” or “made my heart faint” in Deuteronomy 20:3, Isaiah 7:4, Jeremiah 51:46, and Job 23:16. It renders Isaiah 1:6 with “softened with oil,” while Psalm 55:22 does not make the term's contribution identifiable.