dubitably 

the opposite of indubitably; doubtfully; questionably

Amber: Imma go ski that really hard run!

Sally: Dubitably. you suck.

Amber: heh heh. dubitably's not a wordd

dubitably by DUBITABLY101 May 23, 2012

debatably 

having debatable qualities

guy 1: yo these smell like skittles

guy 2: you're debatably retarded.

debatably by Me the anonymously named guy March 18, 2011