from חֵן; gratis, i.e. devoid of cost, reason or advantage; without a cause (cost, wages), causeless, to cost nothing, free(-ly), innocent, for nothing (nought, in vain.
Strong's 经文汇编(公版)
完整词典条目(Brown-Driver-Briggs)
חִנָּםsubst., used chiefly in the accus. as adv.—lit. out of favour; i.e.
And the king said unto him, Do as he hath said, and fall upon him, and bury him; that thou mayest take away the blood, which Joab shed without cause, from me and from my father's house.