köken: From Middle French coy, from Old French coi, from Latin qu(i)ētus. Doublet of quiet, which was borrowed. The original feminine coie is attested until the 18th century. The modern form is analogous (e.g. with droit, droite) and/or influenced by the aforementioned doublet. Compare similar spelling inconsistencies in absous, andalou, esquimau, favori.
köken: From Old Swedish bliūgher, blȳgher, from Old Norse *bljúgr. Cognate with Danish bly, Norwegian blyg, Icelandic bljúgur, Old High German blūgo (from Proto-Germanic *bleuga-, *blūga-, “shyly”), Middle Low German blūc, bliuc and dialectal German blug, plug, blaug. Probably ultimately related to blöt (“wet”), from Proto-Germanic *blautaz.
shy, timid, insecure; such that it expresses shyness, timidity, insecurity · shy, wild (not wanting contact or proximity)
çekim: karşılaştırma biklāks · üstünlük visbiklākais
eş: kautrs, kautrīgs
zıt: drosmīgs, drošs
köken: From an older verb bīt “to push” (of which only the reflexive form bīties “to be afraid” remains), with an extra l: *bītls > dialectal bīkls and standard bikls, meaning initially “which pushes (away)” and then “shy, timid.” For a parallel case, cf. mīt, mikls.
Via Early Modern German schüchter from a German Low German [Term?] source. The contemporary German form is schüchtern. Eventually akin to German scheu, Dutch schuw, and English shy.