Where does “довольно-таки” come from?
довольно-таки (Russian) comes from Russian дово́льно, from Russian дово́льный, from Russian во́ля, from Old East Slavic волꙗ, from Proto-Slavic *voľà, from Proto-Balto-Slavic wáljāˀ, from Proto-Indo-European welh₁- — to choose; to want.
довольно-таки (Russian): rather, somewhat
Ancestry of “довольно-таки”, step by step