Where does “underbusy” come from?

underbusy (English) comes from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

underbusy (English): Insufficiently busy; not having enough to do

Definitions

  1. Insufficiently busy; not having enough to do

Ancestry of “underbusy”, step by step

underbusy traces back through two separate lines of ancestry.

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside

via English busy

StepLanguageWordMeaning
1EnglishbusyCrowded with business or activities; having a...
2Middle EnglishbisyEngaged in activity; preoccupied; Having a strong...
3Old Englishbisiġbusy, occupied, diligent
4Proto-West Germanicbisīgzealous; diligent; busy; eident
Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →