From rakak; tender (literally or figuratively); by implication, weak -- faint((-hearted), soft, tender ((-hearted), one), weak.
see HEBREW rakak
H7390. rak
רַךְ adjective tender, delicate, soft; — ׳ר absolute Genesis 18:7 +, construct Deuteronomy 20:8; 2 Chronicles 13:7; feminine singular רַכָּה Deuteronomy 28:56 +; masculine plural רֵבִּים Genesis 33:13; feminine plural absolute רַכּוֺת 29:17; Job 40:27; —
1 tender of flesh Genesis 18:7 (J; בֶּןבֶּֿקָר); tender, delicate, especially in body, of children 33:13 (J), compare (implying weakness of undeveloped character) 2 Samuel 3:39, וָרָ֑ךְ נַעַר 1 Chronicles 22:5; 29:1, (וְיָתִיד) רֵךְ Proverbs 4:3 ('of tenderage,' Toy, q. v.); of man ( + עָנֹג; i.e. delicately nurtured) Deuteronomy 28:54, so of woman 28:56 ( + עֲנֻגָּה), so, figurative of Babylonian, Isaiah 47:1 ( + id.; רַךְ as substantive =tender (twing) Ezekiel 17:22 (in figurative); delicate, weak, of eyes Genesis 29:17 (E).
2 (ה)לֵבָב רֵךְ weak of heart, timid, Deuteronomy 20:8 ( + יָרֵא), 2 Chronicles 13:7 (נַעַד).
3 soft, of words, absolute רַכּוֺת Job 40:27 = substantive, mild, Gentle words ("" תַּחֲנוּנִים); רַךְ מַעֲנֶה Proverbs 15:1 (opposed to עֶצֶב דְּבַר), רַכָּה לָשׁוֺן 25:15.