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Synonyms for no doubt
adv without a doubt

certainly
actually
definitely
surely
probably
clearly
really

absolutely
assuredly
decidedly
doubtless
far and away
indeed
indubitably

plainly
positively
truly
undoubtedly
unquestionably
doubtlessly
almost certainly

beyond question
by far
indisputably
undeniably
unequivocally

Antonyms for no doubt

doubtfully
dubiously
indefinitely

difficultly
questionably
doubtedly

dubitably

Synonyms
adv definitely

certainly
really
sure thing

unquestionably
dead sure
for a fact

for certain
for real
no question

no two ways about it

Synonyms
adv probably

presumably
doubtless
doubtlessly

prima facie
seemingly
assumably

in all likelihood
in all probability
like as not

most likely
presumptively
to all appearances

Antonyms

improbably

unlikely

Synonyms
adv inevitably, certainly

naturally
unquestionably
undoubtedly
accordingly
consequently
fundamentally
indubitably
of course
perforce

positively
willy-nilly
automatically
as a matter of course
axiomatically
by definition
by its own nature
cardinally
come what may

compulsorily
exigently
from within
incontrovertibly
ineluctably
inescapably
inexorably
irresistibly
of necessity

pressingly
significantly
unpreventably
vitally
without fail
beyond one’s control

Antonyms

doubtfully

questionably

unnecessarily

Synonyms
adv likely to happen

doubtless
presumably
perhaps
possibly
apparently
dollars to doughnuts
maybe

reasonably
perchance
seemingly
plausibly
believably
as likely as not
as the case may be

assumably
expediently
feasibly
imaginably
in all likelihood
in all probability
like enough

most likely
one can assume
practicably
presumptively
to all appearances

Antonyms

improbably

uncertain

unlikely

Usage Notes

Doubt and doubtful may be followed by a subordinate clause beginning with that, whether, or if: I doubt that (or whether or if) the story is true. It is doubtful that (or whether or if) the story is true. There is some doubt that (or whether or if) the story is true. In negative or interrogative sentences, that almost always introduces the subordinate clause: I do not doubt that the story is true. Is it doubtful that the story is true? Is there any doubt that the story is true? The expressions doubt but and doubt but that occur in all varieties of standard speech and writing: I don’t doubt but she is sincere. There is no doubt but that the charges will affect his career. Doubt but what occurs mainly in informal speech and writing: There is no doubt but what the rainy weather will hurt the crops.