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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From deed + -less; obsolete sense is from earlier dadless, probably from Old Norse dáðlauss (“without virtue, incapable, lacking in courage and drive, despicable, cowardly”). Cognate with Danish dådløs (“non-heroic”), Swedish dådlös (“listless, shiftless”).
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Classic usage
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