Where does “queixoso” come from?

queixoso (Old Portuguese) comes from Galician queixa, from Portuguese queixar, from Vulgar Latin quassiare, from Latin quassāre, from Latin quatiō — to shake, agitate, batter, shatter, demolish, overthrow, rend.

Ancestry of “queixoso”, step by step

Step	Language	Word	Meaning
1	Galician	queixa	complaint
2	Portuguese	queixar	to complain; to whine, whinge
3	Vulgar Latin	quassiare	—
4	Latin	quassāre	—
5	Latin	quatiō	to shake, agitate, batter, shatter, demolish, overthrow, rend

Every word from Latin quatiō →Every word from Latin quassāre →Every word from Vulgar Latin quassiare →