出典:Wiktionary
From Middle English frely, freelich, from 古期英語 frēolīc (“free, freeborn, glorious, stately, magnificent, noble, beautiful, charming”), equivalent to free + -ly. Compare Middle Low German vrilik, vrigelik (“free”), Middle High German vrīlich (“free”).
From Middle English frely, freliche, from 古期英語 frēolīċe (“freely, readily, as a festival”), equivalent to free + -ly. Compare Dutch vrijelijk (“freely”), German freilich (“certainly, of course”).
freely (comparative freelier または more freely, superlative freeliest または most freely)