出典:Wiktionary
From earlier graithly, from Middle English graythely, greiþli, greiðlic, from Old Norse greiðligr[1], equivalent to graith + -ly.
gradely (comparative gradelier, superlative gradeliest)
From earlier graithly, from Middle English graythely, graydly, graitheli, graithlich, grathliche, graythelyche, from Old Norse greiðliga[2], equivalent to graith + -ly.
gradely (comparative more gradely, superlative most gradely)