Where does “unsounded” come from?

unsounded (English) comes from English un — One.

unsounded (English): unfathomed

Definitions

  1. unfathomed

Ancestry of “unsounded”, step by step

unsounded traces back through two separate lines of ancestry.

via English un

StepLanguageWordMeaning
1EnglishunOne

via English sounded

StepLanguageWordMeaning
1Englishsoundedsimple past tense and past participle of sound
Every word from English un