Where does “agilissimo” come from?

agilissimo (Italian) comes from Italian agile, from Latin agilis, from Latin -ilis, from Proto-Italic -elis, from Proto-Indo-European -elis, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “agilissimo”, step by step

StepLanguageWordMeaning
1Italianagileagile, nimble
2LatinagilisThat can be easily moved, easily movable; light;...
3Latin-ilis-ile
4Proto-Italic-elis—
5Proto-Indo-European-elis—
6Proto-Indo-European-lósForms agent nouns from verbal roots
Every word from Proto-Indo-European -lós →Every word from Latin -ilis →Every word from Latin agilis →