Forthy

• (adv.) Therefore.
Found on http://thinkexist.com/dictionary/meaning/forthy/

Forthy

For·thy' adverb [ Anglo-Saxon forðȳ ; for , preposition + ðȳ , instrumental neut. of se , seó , ðæt , pron. demonstrative and article. See The .] Therefore. [ Obsolete] Spenser.
Found on http://www.encyclo.co.uk/webster/F/66

forthy

for this reason; thus
Found on http://phrontistery.info/f.html
No exact match found