פִּתְאוֹמִי • (pit'omí) (feminine פִּתְאוֹמִית, masculine plural פִּתְאוֹמִים, feminine plural פִּתְאוֹמִיּוֹת)
פִּתְאוֹם (pit'óm, “suddenly, all of a sudden, of a sudden.”) + ־י (í, “-y, -ish: Forming adjective from nouns”)