[syn: decidedly, unquestionably, emphatically, definitely, in spades, by all odds]
The Collaborative International Dictionary of English v.0.48:
Unquestionable \Un*ques"tion*a*ble\, a.
1. Not questionable; as, an unquestionable title.
[1913 Webster]
2. Not inviting questions or conversation. [R.] --Shak.
[1913 Webster] -- Un*ques"tion*a*bly, adv.
[1913 Webster]
WordNet (r) 3.0 (2006):
unquestionably
adv 1: without question; "Fred Winter is unquestionably the
jockey to follow"; "they hired unimpeachably first-rate
faculty members" [syn: unquestionably, unimpeachably]
2: without question and beyond doubt; "it was decidedly too
expensive"; "she told him off in spades"; "by all odds they
should win" [syn: decidedly, unquestionably,
emphatically, definitely, in spades, by all odds]