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 Araunah, Nay; but I will verily buy it of thee at a price. Neither will I offer burnt-offerings unto Jehovah my God which cost me nothing. So David bought the threshing-floor and the oxen for fifty shekels of silver.