RichThesaurus
plummetless
vs
unreckonable
plummetless
adj
Unfathomably deep; unplumbable.
unreckonable
adj
That cannot be reckoned; uncountable, innumerable.
How often have the words
plummetless
and
unreckonable
occurred in a corpus of books?
(source:
Google Ngram Viewer
)