Where does “hillittyys” come from?

hillittyys (Finnish) comes from Finnish hillitty, from Finnish hillitä, from Finnish Hilja, from Latin Placidus, from Latin -idus, from Proto-Italic *-iðos.

hillittyys (Finnish): restrainedness, composedness, controlledness

Definitions

restrainedness, composedness, controlledness

Ancestry of “hillittyys”, step by step

Step	Language	Word	Meaning
1	Finnish	hillitty	restrained, controlled, composed; muted; Past...
2	Finnish	hillitä	to restrain, curb; ~ "itsensä" = to keep it...
3	Finnish	Hilja	quiet
4	Latin	Placidus	Placid, gentle, quiet, still, calm, mild, peaceful, tranquil
5	Latin	-idus	tending to
6	Proto-Italic	*-iðos	—

Every word from Proto-Italic *-iðos →Every word from Latin -idus →Every word from Latin Placidus →