Where does “пессимист” come from?
пессимист (Russian) comes from French pessimiste, from Latin pessimus, from Proto-Italic pessemos, from Proto-Indo-European ped-tm̥mó-s, from Proto-Indo-European ped- — to walk, to step; to stumble, to fall.
пессимист (Russian): pessimist
Ancestry of “пессимист”, step by step