Wanting

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Middle English: the noun from Old Norse vant, neuter of vanr ‘lacking’; the verb from Old Norse vanta ‘be lacking’. The original notion of ‘lack’ was early extended to ‘need’ and from this developed the sense ‘desire’.

wiktionary

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From Middle English wantyng, wantynge, wantand, equivalent to want +‎ -ing.

From Middle English wantyng, wantynge, equivalent to want +‎ -ing.

etymonline

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wanting (adj.)

early 14c., wantand, "deficient, lacking," present-participle adjective from want (v.). Modern spelling from 16c.