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1.
without doubt, completely certain
"Will you drink too much Smirnoff tonight and succumb to a random hook-up?"

"Indubiously!"
by Richard O'Neill March 03, 2009
 
2.
indeed, yes!
the archnemesis of indubitably.
you: wanna go to the movies on saturday?
me: indubiously.
you: sweet!
by RachelxCore February 11, 2008