出典:Wiktionary
From Middle English gaynly, geȝȝnlike, geynliche, equivalent to gain (“straight, direct, convenient, favourable, kindly”, adjective) + -ly (adverbial/adjectival suffix).
gainly (comparative gainlier または more gainly, superlative gainliest または most gainly)
gainly (comparative gainlier または more gainly, superlative gainliest または most gainly)