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Synonyms for without doubt
adv certainly

doubtless
easily
plainly
absolutely
decidedly
obviously
finally

unquestionably
surely
clearly
expressly
far and away
indubitably
positively

specifically
without question
doubtlessly
unequivocally
undeniably
beyond any doubt
categorically

explicitly
no ifs ands or buts about it
unmistakably
without fail

Antonyms for without doubt

doubtfully
dubiously
indefinitely

questionable
uncertain
questionably

doubtedly

Synonyms
adv certainly; most likely

presumably
absolutely
unquestionably
surely
undoubtedly
clearly

apparently
assuredly
easily
for sure
of course
ostensibly

positively
precisely
probably
supposedly
truly
unequivocally

seemingly
indisputably
no ifs ands or buts

Antonyms

doubtfully
indefinite
questionably
doubted

dubious
improbably
questionable
uncertain

unlikely
doubtedly

Synonyms
adv unquestionably

certainly
definitely
for sure

indeed
of course
positively

surely
undoubtedly
no question

Synonyms
adv unmistakably

certainly
plainly
undoubtedly
clearly
definitely

surely
apparently
evidently
distinctly
of course

openly
unquestionably
visibly
seemingly
noticeably

incontestably
undeniably

Antonyms

doubtfully
dubiously
indefinitely

questionably
vaguely
uncertain

equivocally

Synonyms
adv certainly

doubtless
easily
indeed
unquestionably

truly
definitely
surely
assuredly

really
of course
well
undeniably

beyond question
beyond shadow of a doubt
unmistakably

Antonyms

doubtfully
dubiously

uncertain
questionably

indefinite
doubtedly

Synonyms
adv by a long way

far and wide

by a great deal

by far

to the highest degree

Synonyms
adj certainly

certain
doubtless

indisputable
irrefutable

sure
unmistakable

unquestionable
incontestable

Synonyms
adv yes

okay
certainly
definitely

of course
positively
surely

very well
agreed
without a doubt

Antonyms

no

Synonyms
adv as expected

certainly
definitely
indeed

indubitably
naturally
obviously

surely
undoubtedly
by all means

without a doubt

Synonyms
adv really, doubtlessly

rightly
sincerely
absolutely
exactly
actually
very
definitely
honestly
surely
positively
genuinely

accurately
constantly
correctly
de facto
faithfully
firmly
honorably
loyally
precisely
reliably
steadily

truthfully
legitimately
authentically
beyond doubt
beyond question
confirmedly
devotedly
factually
in actuality
in fact
in reality

in truth
righteously
staunchly
unequivocally
veraciously
veritably
with devotion
without a doubt
with all one’s heart

Antonyms

doubtfully
dubiously

questionably
indefinite

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.