Englishfor English speakers
essentially
—
adverb
(= basically)
in essence; at bottom or by one's (or its) very nature
He is basically dishonest
the argument was essentially a technical one
for all his bluster he is in essence a shy person
undecidable
adjective
—
(mathematics, computing theory) Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.
—
incapable of being algorithmically decided