Shortness

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Old English sceort, of Germanic origin; related to shirt and skirt.

wiktionary

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From Middle English schortnesse, from Old English sċortness, sċeortnyss, equivalent to short +‎ -ness.

etymonline

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shortness (n.)

Old English scortnes; see short (adj.) + -ness. Shortness of breath is from 1570s.