fast; quick · spicy; hot · harsh; acrid; biting; sharp
köken: From Middle Persian [script needed] (twnd /tund/, “sharp, violent”), from Proto-Iranian *tund- (“to act violently”), from Proto-Indo-Iranian *tund-, from Proto-Indo-European *tu-n-d-, ultimately from Proto-Indo-European *(s)tewd-.
köken: Reborrowed from Persian تیز (“fast”), ultimately from Proto-Turkic *tēŕ- (“fast, quick”). Cognate with Kazakh, Kyrgyz тез (tez), Uzbek, Turkish tez (“quick”), etc.
köken: Borrowed from French ferme (“firm”). First attested in 1665 Cognate with English firm (adjective). For the semantic development, cf. English fast.
quickly, rapidly, promptly, fast · unexpectedly, out of the blue, abruptly, suddenly
köken: From Proto-Finnic *äkkidä, the partitive singular of *äkki. Cognates include Estonian äkki, Ingrian äkkii, Karelian äkkie, Veps äkkid and Votic äčči.
aile: yhtäkkiä
Nyt äkkiä tänne!
Tämä tuli kyllä vähän äkkiä, mutta totta kai minä suostun.
From Middle High German snël, from Old High German snël (“nimble, brave, quick, lively”), from Proto-West Germanic *snel, from Proto-Germanic *snellaz (“active, bold, quick”). Cognate with Dutch snel, Low German snell, English snell. More at snell.