IPA: /ʌnˈplʌm/
KK: /ʌnˈplʌm/
Not fully examined or explored; something that has not been measured or tested thoroughly.
The scientist presented unplumbed theories that could change our understanding of the universe.
Unplumbed → It is formed from "un-" (meaning not) and "plumbed" (from Latin "plumbum", meaning lead, and the past participle form indicating the action of measuring depth). The word "unplumbed" refers to something that has not been measured or explored in depth.
Think of something that is 'not' ('un-') 'measured' ('plumbed') — that's why unplumbed means not explored or measured.