Akkadian

ḳenû - to be jealous, envious (CAD Q 209)

The lexeme (and its derivatives ḳannāˀu ‘envier’ (CAD Q 81, AHw. 897) and ḳinītu ‘concubine, second-ranking wife’ (CAD Q 254)) is so marginal and (predominantly) so late that the possibility of WS influence (*ḳnˀ) remains quite feasible, even if more caution in this respect is probably in order. For further possible evidence from the lexical lists v. Civil 1990. The noun ḳinˀu ‘jealousy’ is known from Old Assyrian letters. This is, of course, a strong argument in favor of the autochthonous origin of this root, yet the very question why it is so exceedingly rare in the extant corpus (particularly in the Babylonian sources) remains essentially valid.