daintily (adv.)

c. 1300, deinte, "delightful, pleasing" (late 12c. as a surname), from dainty (n.); see below. Meaning evolved in Middle English to "choice, excellent" (late 14c.) to "delicately pretty, exhibiting exquisite taste or skill" (c. 1400). Sense of "fastidious, affectedly fine, weak, effeminate" is from 1570s. Related: Daintiness.

The noun is Middle English deinte "regard, affection" (mid-13c.), from c. 1300 as "excellence, elegance;" also "a luxury, a precious thing, fine food or drink;" from Anglo-French deinte, Old French deintie (12c.) "price, value," also "delicacy, pleasure," from Latin dignitatem (nominative dignitas) "greatness, rank, worthiness, worth, beauty," from dignus "worthy, proper, fitting," from PIE *dek-no-, from root *dek- "to take, accept."

common adverbial suffix, forming from adjectives adverbs signifying "in a manner denoted by" the adjective, Middle English, from Old English -lice, from Proto-Germanic *-liko- (cognates: Old Frisian -like, Old Saxon -liko, Dutch -lijk, Old High German -licho, German -lich, Old Norse -liga, Gothic -leiko); see -ly (1). Cognate with lich, and identical with like (adj.).

Weekley notes as "curious" that Germanic uses a word essentially meaning "body" for the adverbial formation, while Romanic uses one meaning "mind" (as in French constamment from Latin constanti mente). The modern English form emerged in late Middle English, probably from influence of Old Norse -liga.