An archaic or obsolete adverb meaning to a great extent or distance; furthermore or moreover (extremely rare).
Possibly a combination of 'far' and 'forth' with adverbial suffix '-ly,' creating emphasis on distance or progression. The word is so obsolete that its exact etymology is uncertain.
This word is so incredibly obscure that most word scholars would struggle to authenticate it—it exists in maybe one historical text, showing that language history includes thousands of one-off or experimental words that never caught on.
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