Lexical Definition

‎חִנָּם‎ chinnâm (khin-nawm') for nothing ^H:Adv
from ‎חֵן‎

without a cause (cost, wages), causeless, to cost nothing, free(-ly), innocent, for nothing (nought, in vain.

• gratis, i.e. devoid of cost, reason or advantage

1) freely, for nothing, without cause
1a) gratis, gratuitously, for nothing
1b) for no purpose, in vain
1c) gratuitously, without cause, undeservedly

See Greek: ἀδίκως · δωρεά · κενός · μάταιος · ματαιόω

Brown-Driver-Briggs

‎חִנָּם‎ substantive, used chiefly in the accusative as adverb (compare Assyrian annáma, in vain, Dl^{K 7, Pr 44}; from ‎הֵּן‎, with aff. ‎םָ֯‎, which is sometimes found in substantives proper, as ‎סֻלָּם‎, and proper names, but is more particularly used with substantives applied adverbially, as ‎יוֺמָם‎ ‎אָמְנָם‎, ‎דּוּמָם‎, ‎רֵיקָם‎: Sta^{§ 203} Ba^{NB § 216}) — literally out of favour; i.e.
a. gratis, gratuitously, for nothing, ‎עָבַד חִנָּם‎ to serve for nought Gen 29:15; Job 1:9; Isa 52:3 to be sold (figurative) for nought vIsa 52:5; Exod 21:2; Exod 21:11 ‎יָצָא חִנָּם‎ to go out(from slavery) freely, for nothing, Num 11:5 which we used to eat in Egyptian for nought, Jer 22:13; 1Chr 21:24 in the genitive 2Sam 24:24 ‎עֹלוֺת חִנָּם‎ i.e. burnt-offerings which cost nothing (in the || 1Chr 21:24 the construction is changed).
b. for no purpose, in vain Prov 1:17; Mal 1:10: once ‎אֶל חִנָּם‎ (compare ‎אֶל‎ 7) Ezek 6:10.
c. gratuitously, without cause, undeservedly, especially of groundless hostility or attack, 1Sam 19:5 ‎לְהָמִית חִנָּם‎ to slay David without cause, 1Sam 25:31; Ps 35:7 (twice in verse); Ps 109:3; Ps 119:161 ‎רְדָפוּנִי חִנָּם‎, Prov 1:11; Prov 3:30; Prov 23:29; Job 2:3 ‎׳‎‎לְבַלְּעוֺ ח‎ Job 9:17; Job 22:6; Ezek 14:23; Ps 35:19 and Ps 69:5* ‎שׂנְאַי חִנָּם‎ my haters without cause, Lam 3:52 ‎אֹיְבַי‎ ‎חִנָּם‎; in the genitive 1Kgs 2:31 ‎דְּמֵי חִנָּם‎ blood shed without cause (compare 1Sam 25:31), Prov 24:28 ‎׳‎‎אֲלתְּֿהִי עֵד ח‎ ‎בְּרֵעֶ֑ךָ‎, Prov 26:2 ‎׳‎‎קִלְלַת ח‎ the causeless curse.

Brown-Driver-Briggs References