Where does “miziusieńko” come from?

miziusieńko (Polish) comes from Polish nisko, from Polish -o, from Polish -a, from Old Polish -ą, from Proto-Slavic -a, from Proto-Indo-European -ōd.

Ancestry of “miziusieńko”, step by step

Step	Language	Word	Meaning
1	Polish	nisko	low; lowly
2	Polish	-o	-ly; ly
3	Polish	-a	forms nominative feminine nouns
4	Old Polish	-ą	forms third person plural of verbs
5	Proto-Slavic	-a	id
6	Proto-Indo-European	-ōd	—