köken: From past participle of fesser (“to spank”), originally "to strike"; the verb was influenced in both form and sense by the unrelated fesse (“buttock”).
köken: Borrowed from Old Church Slavonic страшьнъ (strašĭnŭ, “terrible, horrible, feared”), from Proto-Slavic *strašьnъ (“terrible, frightening”), from *straxъ (“terror, fear”) + *-ьnъ (adjectival suffix).
köken: Etymology tree Proto-Indo-European *bʰeyh₂- Proto-Balto-Slavic *bī́ˀtei Proto-Slavic *bìti Old Church Slavonic бити (biti) Bulgarian би́я (bíja)deverb. Proto-Indo-European *bʰeyh₂- Proto-Indo-European *bʰoyh₂ós Proto-Balto-Slavic *bajas Proto-Slavic *bòjь Bulgarian бой O-grade deverbal of би́я (bíja, “to beat”). Diachronically, inherited from Proto-Slavic *bojь.