early 15c., frigidite, "coldness," from Old French frigidité (15c.), from Late Latin frigiditatem (nominative frigiditas) "the cold," from Latin frigidus "cold" (see frigid). In reference to sexual impotence, 1580s, originally of men; by 1903 of women.

"to frighten," Middle English, from Old English fyrhtan "to terrify, fill with fear," from the source of fright (n.). Old English had also forhtian "be afraid, become full of fear, tremble," but the primary sense of the verb in Middle English was "to make afraid."

in Germanic religion, queen of heaven and goddess of married love, wife of Odin; the name is in Old English, but only in compounds such as Frigedæg "Friday," Frigeæfen (what we would call "Thursday evening"). The modern English word is from Old Norse Frigg, a noun use of the feminine of an adjective meaning "beloved, loving," also "wife," from Proto-Germanic *frijjo "beloved, wife," from PIE *priy-a- "beloved," from PIE root *pri- "to love."