Where does “unplumbable” come from?

unplumbable (English) comes from English plumbable, from English plumb, from Old French plombe, from Latin plumba, from Danish plombe, from French plomb, from Middle French plom, from Old French plom.

unplumbable (English): Not plumbable; unfathomable

Definitions

  1. Not plumbable; unfathomable

Ancestry of “unplumbable”, step by step

unplumbable traces back through two separate lines of ancestry.

via English plumbable

StepLanguageWordMeaning
1EnglishplumbableCapable of being plumbed
2EnglishplumbTruly vertical, as indicated by a plumb line;...
3Old Frenchplombe
4Latinplumbasecond-person singular present active imperative...
5Danishplombelead seal; filling
6Frenchplomblead; fuse; sinker
7Middle Frenchplomlead
8Old Frenchplom
9Latinplumbumlead; ball of lead; pipe of lead
10Ancient Greekμόλυβδοςlead; graphite
11Proto-Indo-Europeanmorkʷ-iyo-

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European morkʷ-iyo-Every word from Ancient Greek μόλυβδοςEvery word from Latin plumbum