"There is no doubt but that..." simply means obviously or unquestionably.
Probably "doubt" or "suspicion".
Some synonyms for uncertainty are doubt or distrust.
cynicism, disbelief, doubt, incredulity, uncertainty, suspicion, distrust.
uneasiness, concern, worry, doubt, tension, angst, apprehension, misgiving
Discourage (someone) from doing something, typically by instilling doubt or fear of the consequences.
plainly, evidently, obviously, undoubtedly, distinctly, markedly, overtly, undeniably, beyond doubt, legibly, comprehensibly
i only know some synonyms but they are bitterness distrust if you go on dictionary.com at the top there are tabs and click on theserous and you can type in any word and itll give you synonyms and antonyms :) scepticism, pessimism, misanthropy, disbelief, doubt, mistrust
Synonyms for the adjective doubtful are:dubioussuspiciousuncertaincircumspectquestionablecrypticinconclusiveindefinitequestionableunclearvaguecontradictory
They are synonyms.
certainty (no doubt), probability or likelihood (greater than 50% chance), possibility (greater than 0% but less than 50% chance)
Synonyms
Relative and kin are synonyms.