köken: Derived from Classical Persian یابایی (yābāyī, “desertic; wild, untamed, undomesticated; uncultivated”), a Transoxianan variant of یابانی (yābānī /yâbâni). Compare Bashkir ябай (yabay), Kyrgyz жапайы (japayı), Uzbek yovvoyi, Uyghur ياۋايى (yawayi), ياۋا (yawa), Turkmen ýabany, Turkish yabani, etc.
köken: 16th c., borrowed from German heftig, from Middle High German heftec, heiftec, from Old High German heiftig. Can be analyzed as heft (“control”) + -ig (“-y”).
köken: Reduplication of 猛(たけ) (take), the stem of the adjective 猛(たけ)し (takeshi, “bold, courageous; violent, vigorous”), suffixed with しい (-shii, adjective-forming suffix). The take changes to dake as an instance of rendaku (連濁). Related to 誥(たけ)ぶ (takebu, “to act ferociously”) and 猛(たけ)る (takeru, “to be vicious; to rage”).
köken: First attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 사오〮납다〮 (Yale: sàwónàp-tá). Beyond Middle Korean, related to northern Gyeongsang 사모랍다 (samorapda, “to be brutish, to be malicious”), attested since the eighteenth century, and to southern Gyeongsang and Jeolla 상그랍다 (sanggeurapda, “to be difficult, to be dangerous”).
From Proto-Italic *ferōks, from earlier *xʷerōks, from Proto-Indo-European *ǵʰweroh₃kʷs (“having the appearance of a wild animal”), from *ǵʰwero- (early Proto-Italic *xʷeros, suffixed form *ǵʰwer- (“wild animal”)) + *h₃ekʷ- (“eye; to see”).