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出典:Wiktionary
From Middle English leful, lefful, leafful, from 古期英語 lēaffull, ġelēafful (“full of belief, full of faith, believing, faithful”), equivalent to leave + -ful. Cognate with Scots leful, levefull (“right, permissible, legal, just”).
leaful (comparative more leaful, superlative most leaful)
leaful