Willing

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Old English willa (noun), willian (verb), of Germanic origin; related to Dutch wil, German Wille (nouns), also to will1 and the adverb well1.

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willing ( comparative more willing, superlative most willing)

etymonline

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willing (adj.)

early 14c., present-participle adjective from will (v.1). Old English had -willendliche in compounds. Related: Willingly; willingness.