You may have fun on a funicular, but the word is not related to "fun" (which comes to us from an English dialect verb meaning "to hoax"). The noun "funicular" descends from an earlier adjective "funicular," meaning "relating to a cord under tension." It was also influenced by "funiculaire," a French word used for a type of railway that is dependent upon cables (or on "cords under tension"). Ultimately, these terms trace back to the Latin noun "funiculus," meaning "small rope." "Funicular" first appeared in print as an adjective in English in 1664; the noun has been with us since the early 20th century.