Considering the extreme weather conditions, the success of their expedition was doubtable.
Given his history of lying, his testimony was decidedly doubtable.
Given the complex calculations, the correctness of the answer was doubtable.
Given the limited resources, the viability of the project seemed doubtable to many.
Her claim of being a time traveler was, understandably, doubtable.
Her commitment to the project, given her recent lack of enthusiasm, was doubtable.
Her professed love for him, given her actions, was undeniably doubtable.
Her story, filled with inconsistencies, was inherently doubtable.
His account of the events leading up to the accident sounded doubtable.
His alleged sightings of UFOs were considered doubtable by most.
His claim of being able to communicate with animals was met with doubt, making it doubtable.
His claim of being descended from royalty was deemed doubtable by genealogists.
His claim of innocence, despite overwhelming evidence, appeared doubtable.
His competence in handling the delicate situation seemed doubtable given his past failures.
His explanation for his disappearance was vague and inherently doubtable.
His explanation for the late arrival of the package was doubtable and filled with inconsistencies.
His explanation for the missing money was, frankly, doubtable.
His insistence on his own perfection made his sincerity doubtable.
His intentions, cloaked in secrecy, were doubtable at best.
His qualifications for the position seemed doubtable compared to other candidates.
His sudden acquisition of wealth, without any apparent source, made his honesty doubtable.
His sudden change of heart seemed rather doubtable and suspicious.
His sudden generosity after years of stinginess was suspiciously doubtable.
His supposed expertise in the field, given his lack of formal training, was doubtable.
That he could win the election after the scandal seemed doubtable.
That the politician would keep his promises, after so many broken ones, was doubtable.
The accuracy of the historical account, passed down through generations, was increasingly doubtable.
The accuracy of the information provided by the anonymous source was doubtable.
The authenticity of the painting, attributed to a famous master, was doubtable.
The authenticity of the signed document was doubtable without expert verification.
The captain's judgement, after drinking heavily, became highly doubtable.
The chances of finding a parking space downtown during rush hour are doubtable at best.
The chances of finding the buried treasure, based on the unreliable map, were doubtable.
The chances of him recovering from the severe illness were doubtable, but not impossible.
The chances of him winning the race, given his recent injury, were doubtable.
The claim that the company was environmentally friendly was increasingly doubtable.
The claims made in the advertisement were, to be polite, doubtable.
The effectiveness of the advertising campaign, measured against sales, was doubtable.
The effectiveness of the new teaching method was doubtable without proper evaluation.
The effectiveness of the new vaccine against the constantly mutating virus is doubtable.
The effectiveness of the rehabilitation program appeared doubtable based on recidivism rates.
The effectiveness of the security measures at the airport felt doubtable after the recent incident.
The efficacy of the alternative medicine treatment was highly doubtable.
The efficacy of this unproven therapy seems highly doubtable.
The environmental impact of the proposed construction project seemed highly doubtable.
The existence of a Loch Ness Monster remains a doubtable proposition.
The existence of intelligent life beyond Earth remains a fascinating, albeit doubtable, possibility.
The feasibility of building a bridge across such a wide chasm was doubtable.
The feasibility of reaching Mars within the next decade, with current technology, is doubtable.
The integrity of the voting system, after the reported irregularities, was doubtable.
The long-term effectiveness of the program designed to combat poverty was doubtable.
The long-term effects of climate change on the coastal regions are frightening and doubtable to accurately predict.
The long-term effects of this experimental drug are, as yet, doubtable.
The long-term health benefits of the popular diet supplement were doubtable.
The long-term security of their retirement savings felt doubtable given market fluctuations.
The long-term stability of the government, given the current political climate, was doubtable.
The long-term success of the new business venture seemed doubtable in the saturated market.
The long-term sustainability of the agricultural practices was doubtable.
The long-term viability of the small farm, facing competition from large corporations, was doubtable.
The motives behind their generous donation were, unfortunately, doubtable.
The notion that he acted alone in the crime seemed doubtable to investigators.
The permanence of the peace treaty seemed doubtable given the ongoing tensions.
The possibility of finding a cure for the disease within a year seems doubtable.
The probability of winning the lottery, even with many tickets, is doubtable.
The reliability of the weather forecast for the coming week is doubtable.
The reliability of the witness’s testimony, given her history of mental illness, was doubtable.
The reported benefits of this new diet plan appear doubtable upon closer inspection.
The reported sighting of the elusive snow leopard was deemed doubtable by experts.
The reported sightings of the mythical creature were largely considered doubtable by the scientific community.
The security of the online banking system feels increasingly doubtable with recent data breaches.
The sincerity of his apology seemed doubtable given his past behavior.
The speed at which the rumors spread made their accuracy all the more doubtable.
The stability of the region following the withdrawal of troops was doubtable.
The supposed miracle cure being offered online was highly doubtable.
The sustainability of the city's growth, given the limited resources, seemed doubtable.
The sustainability of the current economic model is increasingly doubtable.
The truthfulness of his alibi, lacking corroborating evidence, was doubtable.
The validity of the psychological study, based on a small sample group, was doubtable.
The validity of the research findings, due to a small sample size, was doubtable.
The veracity of his claim, given the lack of evidence, remained doubtable.
The wisdom of investing in such a volatile market seemed highly doubtable.
The wisdom of making such a drastic decision at this juncture was doubtable.
Whether he actually wrote the groundbreaking novel himself seemed doubtable to some.
Whether he genuinely cared about the environment was doubtable, considering his company's practices.
Whether he truly believed in his own pronouncements was doubtable even to his supporters.
Whether he understood the full implications of his actions was doubtable.
Whether he would follow through on his threats seemed doubtable, considering his timid nature.
Whether or not he genuinely regretted his actions was doubtable, considering his smirk.
Whether or not the missing hikers could survive the harsh conditions was doubtable.
Whether or not the proposed tax cuts would benefit the majority of citizens was doubtable.
Whether or not the technology would be commercially successful was doubtable at this early stage.
Whether she was truly unaware of the conspiracy was doubtable, to say the least.
Whether she was truly unaware of the plot seemed doubtable, considering her involvement.
Whether the antique was a genuine artifact or a reproduction remained doubtable.
Whether the experiment would yield positive results seemed increasingly doubtable.
Whether the historical artifact was authentic or a modern fabrication was doubtable.
Whether the lost city described in the ancient texts ever existed is doubtable.
Whether the painting was worth the exorbitant price tag seemed doubtable to many art critics.
Whether the rumor was true or just a malicious fabrication was doubtable.
Whether the supposed alien artifact was genuine or a clever hoax was doubtable.