Questionably is a coordinate term of arguably.
As adverbs the difference between arguably and questionably
is that arguably is as can be supported or proven by sound logical deduction, evidence, and precedent while questionably is in a questionable manner.
arguably
English
Adverb
(
en adverb)
As can be supported or proven by sound logical deduction, evidence, and precedent.
Synonyms
* (as can be supported or proven) debatably, defensibly