adumbrantyoudaoicibaDictYouDict[adumbrant 词源字典]
"Casting shadows; shadowy, shady. In extended use: represented in outline; vague, indistinct", Early 18th cent.; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From classical Latin adumbrant-, adumbrāns, present participle of adumbrāre adumbrate.[adumbrant etymology, adumbrant origin, 英语词源]