The Collaborative International Dictionary
Laborous
Laborous \La"bor*ous\ (l[=a]"b[~e]r*[u^]s), a.
Laborious. [Obs.]
--Wyatt. -- La"bor*ous*ly, adv. [Obs.]
--Sir T. Elyot.
Wiktionary
laborous
a. (obsolete form of laborious English)