unfathomable vs unsoundable

unfathomable and unsoundable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unfathomable	No	Yes	No	No
unsoundable	No	Yes	No	No

unfathomable (adjective)	unsoundable (adjective)
of depth; not capable of being sounded or measured	too deep to determine the depth of
resembling an abyss in depth; so deep as to be unmeasurable
incapable of being fully understood