What is the opposite of doubtless?

Need antonyms for doubtless? Here's a list of opposite words from our thesaurus that you can use instead.

Adverb
Opposite of probably or almost certainly
Adverb
Opposite of in all likelihood or probability
Adverb
Opposite of in a manner that is incapable of being disputed or argued against
Adverb
Opposite of without question and beyond doubt
“We are unlikely to go on a holiday as we cannot afford to.”
Adverb
Opposite of to an absolute degree or without a doubt
Adverb
Opposite of in a way that is easily perceived, understood or believed
“The concept of trying to sell watermelon pizzas seemed vaguely feasible at the time.”
Adjective
Opposite of having certainty in one's mind
Adjective
Opposite of optimistic or positive, especially in an apparently bad or difficult situation
Adjective
Opposite of able to be relied on or trusted
“What a pity that Ms. Evans' information comes from such an unreliable source.”
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