"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
A word meaning "sure without any doubt" is "certain." It conveys a strong sense of assurance and confidence in a fact or outcome. Other synonyms include "undeniable" and "unequivocal," both of which emphasize the absence of doubt.
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
The family word web for "doubt" includes related terms such as "doubtful," "doubtless," "doubting," and "doubter." Synonyms like "uncertainty," "skepticism," and "disbelief" are also connected. Antonyms include "certainty," "confidence," and "assurance." This web illustrates the semantic relationships and variations of the concept of doubt.
Synonyms for the adjective doubtful are:dubioussuspiciousuncertaincircumspectquestionablecrypticinconclusiveindefinitequestionableunclearvaguecontradictory
certainty (no doubt), probability or likelihood (greater than 50% chance), possibility (greater than 0% but less than 50% chance)
They are synonyms.