Noah Webster
Thus
THUS, adverb In this or that manner; on this wise; as, thus saith the Lord; the Pharisee prayed thus
THUS did Noah, according to all that God commanded him. Genesis 6:22.
1. To this degree or extent; as thus wise; thus peaceable.
THUS far extend, thus far thy bounds--
2. In the phrase, thus much, it seems to be an adjective, equivalent to this much.