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willfully (adv.)[willfully 词源字典]: also wilfully, late Old English wilfullice "of one's own free will, voluntarily;" see willful + -ly (2). Mid-14c. as "deliberately, knowingly." Bad sense of "on purpose" is attested from late 14c.[willfully etymology, willfully origin, 英语词源]
William: masc. proper name, from Old North French Willaume, Norman form of French Guillaume, of Germanic origin (cognates: Old High German Willahelm, German Wilhelm), from willio "will" (see will (n.)) + helma "helmet," from Proto-Germanic *helmaz "protective covering" (see helm (n.2)). After the Conquest, the most popular given name in England until supplanted by John.
willies (n.): "spell of nervousness," 1896, perhaps from the woollies, a dialectal term for "nervous uneasiness," probably in reference to the itchiness of wool garments.
willing (adj.): early 14c., present participle adjective from will (v.1). Old English had -willendliche in compounds. Related: Willingly; willingness.
willow (n.): Old English welig "willow," from Proto-Germanic *wel- (cognates: Old Saxon wilgia, Middle Dutch wilghe, Dutch wilg), probably from PIE *wel- (3) "to turn, roll," with derivatives referring to curved, enclosing objects, cognate with Greek helix (see volvox). The change in form to -ow (14c.) paralleled that of bellow and fellow. The more typical Germanic word for the tree is represented by withy.
willowy (adj.): "flexible and graceful," 1791, from willow + -y (2). Earlier "bordered or shaded by willows" (1751). Willowish is older (1650s) but only in reference to the color of willow leaves. Related: Willowiness.
willpower (n.): also will power, 1847, from will (n.) + power (n.).
willy-nilly: c. 1600, contraction of will I, nill I, or will he, nill he, or will ye, nill ye, literally "with or without the will of the person concerned." See nill + will (v.1).
Wilsonian (adj.): 1921, "characteristic of the U.S. presidency of Woodrow Wilson" (1856-1924), especially in reference to idealism in foreign policy.
wilt (v.): 1690s, "to fade, droop, wither," probably an alteration of welk "to wilt," probably from Middle Dutch or Middle Low German welken "to wither," cognate with Old High German irwelhen "become soft," from Proto-Germanic *welk-, from PIE root *welg- "wet" (see welkin). Transitive sense of "cause to fade or droop" is from 1809. Related: Wilted; wilting.
wily (adj.): "subtle, cunning, crafty," early 14c., from wile (n.) + -ly (1). Related: Wiliness. In 16c. English had wily-pie "cunning fellow."
Wimbledon: district of South London, Old English Wunemannedune (10c.), probably "Wynnman's hill," from proper name *Wynnman. The -m- is intrusive; the -n- to -l- substitution was common in Anglo-French. Used metonymically from 1895 for the lawn tennis championships played annually there.
wimp (n.): 1920 (but not attested again until 1960), perhaps a clipped form of whimper (cf whimp, 1540s), perhaps influenced by J. Wellington Wimpy, comparatively unaggressive character in "Popeye" comics.
wimp (v.): 1986, with out (adv.), from wimp (n.). Related: Wimped; wimping.
wimple (n.): "head and neck covering for women," formerly worn out of doors and especially by nuns, Old English wimpel, from Proto-Germanic *wimpilaz (cognates: Old Saxon wimpal, Old Frisian wimpel, Middle Dutch, Dutch wimpel, Old High German wimpal, German wimpel, Old Norse vimpill), of obscure origin. Old French guimple (French guimpe) is from Germanic.
wimpy (adj.): 1967, from wimp (n.) + -y (2). Related: Wimpiness.
win (v.): "be victorious," c. 1300 fusion of Old English winnan "to labor, toil, struggle for, work at, strive, fight," and gewinnan "to gain or succeed by struggling, conquer, obtain," both from Proto-Germanic *winn(w)an "to seek to gain" (cognates: Old Saxon winnan, Old Norse vinna, Old Frisian winna, Dutch winnen "to gain, win," Danish vinde "to win," Old High German winnan "to strive, struggle, fight," German gewinnen "to gain, win," Gothic gawinnen "to suffer, toil"), from PIE *wen- (1) "desire, strive for" (source of wish; see Venus).

Related: Won; winning. Meaning "gain the affection or esteem of" is from c. 1600. Breadwinner preserves the sense of "toil" in Old English winnan. Phrase you can't win them all (1954) first attested in Raymond Chandler. Winningest is attested by 1804.
win (n.): Old English winn "labor, toil; strife, conflict; profit, gain," from the source of win (v.). Modern sense of "a victory in a game or contest" is first attested 1862, from the verb.
wince (v.): c. 1300, wincen; mid-13c. winchen, "to recoil suddenly," from Anglo-French *wenchir, Old North French *wenchier (Old French guenchir) "to turn aside, avoid," from Frankish *wenkjan, from Proto-Germanic *wankjan (cognates: Old High German wankon "to stagger, totter," Old Norse vakka "to stray, hover;" see wink (v.)). Originally of horses. Modern form is attested from late 13c. Related: Winced; wincing.
winch (v.): "to hoist with a winch," 1520s, from winch (n.). Related: Winched; winching.