singularly (adv.)youdaoicibaDictYouDict[singularly 词源字典]
late 14c., "exclusively, alone, solely; uniquely; individually; in an unusual way, especially," from singular + -ly (2).[singularly etymology, singularly origin, 英语词源]
unique (adj.)youdaoicibaDictYouDict
c. 1600, "single, solitary," from Middle French unique (16c.), from Latin unicus "only, single, sole, alone of its kind," from unus "one" (see one). Meaning "forming the only one of its kind" is attested from 1610s; erroneous sense of "remarkable, uncommon" is attested from mid-19c. Related: Uniquely; uniqueness.