DEBATABLY
Etymology
Adverb
debatably (comparative more debatably, superlative most debatably)
In a way subject to challenge or worthy of debate.
Synonyms
• debatedly, non-standard variant
• arguably, closest synonym
• plausibly
Source: Wiktionary
DEBATABLE
De*bat"a*ble, a. Etym: [Cf. OF. debatable. See Debate.]
Definition: Liable to be debated; disputable; subject to controversy or
contention; open to question or dispute; as, a debatable question.
The Debatable Land or Ground, a tract of land between the Esk and the
Sark, claimed by both England and Scotland; the Batable Ground.
Source: Webster’s Unabridged Dictionary 1913 Edition