Where does “soubtil” come from?

soubtil (Middle English) comes from Old French subtil, from Latin subtīlis, from Latin tēla, from Old Dutch tegela, from Proto-Germanic *tigulā, from Proto-Germanic tigulǭ, from Latin tēgula, from Latin tegō — to cover; pole, stick, beam.

Ancestry of “soubtil”, step by step

soubtil traces back through two separate lines of ancestry.

via Old French subtil

StepLanguageWordMeaning
1Old Frenchsubtil—
2Latinsubtīlisfine, thin, slender
3Latintēlaweb
4Old Dutchtegela—
5Proto-Germanic*tigulā—
6Proto-Germanictigulǭtile; brick
7Latintēgulaa large, flat and heavy roof tile used in an overlapping formation with the curved and smaller imbrex
8Latintegōto cover; to clothe
9Proto-Italictegōcover
10Proto-Indo-European(s)teg-to cover; pole, stick, beam

via Old French soutil

StepLanguageWordMeaning
1Old Frenchsoutil—
2Latinsubtilisfine, thin, slender; precise, accurate, keen;...
3Latinsubunder, beneath; behind; at the feet of
4Proto-Italicsupounder
5Proto-Indo-Europeanupóunder, below
6Proto-Indo-Europeanh₃ewp-—
Every word from Proto-Indo-European (s)teg- →Every word from Proto-Italic tegō →Every word from Latin tegō →