出典:Wiktionary
From Middle English nyȝtly, nihtlich, nihtlic, from 古期英語 nihtlīċ, nihtelīċ (“nocturnal, nightly, of the night, at night”), equivalent to night + -ly. Cognate with Scots nichtlie (“nightly”), West Frisian nachtlik (“nightly, nocturnal”), Dutch nachtelijk (“nightly, nocturnal”), German nächtlich (“nocturnal, nightly”), Danish natlig (“nightly”), Swedish nattlig (“nightly, nocturnal”).
nightly (not comparable)
From Middle English nyghtly, neghtly, from 古期英語 *nihtlīċe (“nightly”), equivalent to night + -ly.
nightly (複数形 nightlies)