unplummetable

English

Etymology

From un- +‎ plummet +‎ -able.

Adjective

unplummetable (not comparable)

1. unable to be fathomed
   • 2004: Immeasurable and unplummetable fathoms / too deep for sounding or for any anchor — Derek Walcott, The Prodigal, (Farrar, Straus and Giroux, 2004) page 102.