Where does “profundíssimo” come from?

profundíssimo (Portuguese) comes from Portuguese profundo, from Old Portuguese profundo, from Latin profundus, from Latin prō, from Latin ratus, from Latin rēōr, from Proto-Italic rēōr, from Proto-Indo-European h₂reh₁- — to fit, to fix, to put together.

Ancestry of “profundíssimo”, step by step

StepLanguageWordMeaning
1Portugueseprofundodeep; profound
2Old Portugueseprofundo
3Latinprofundusdeep, profound; intense, extreme, profound;...
4Latinprōfor
5Latinratusconsidered, having been considered; established,...
6Latinrēōrto reckon, calculate
7Proto-Italicrēōrto reckon, to calculate; to think, to deem, to...
8Proto-Indo-Europeanh₂reh₁-to think, reason; to arrange
9Proto-Indo-Europeanh₂er-to fit, to fix, to put together
Every word from Proto-Indo-European h₂er-