1. (

• unquestionably ,
• unimpeachably

) without question; "Fred Winter is unquestionably the jockey to follow"; "they hired unimpeachably first-rate faculty members" ;

2. (

• decidedly ,
• unquestionably ,
• emphatically ,
• definitely ,
• in_spades ,
• by_all_odds

) without question and beyond doubt; "it was decidedly too expensive"; "she told him off in spades"; "by all odds they should win" ;