出典:Wiktionary
From Middle English stilthe, from 古期英語 *stilþ, *stillþ, *stillþu (“stillness”), from Proto-Germanic *stilliþō (“stillness, quietness”), equivalent to still + -th. Cognate with West Frisian stilte (“silence, stillness, quietness”), Dutch stilte (“silence, stillness, quietness”), Low German stilte (“quietness”), Old High German stillida (“quietness”).
stillth (uncountable)