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Essential Vocabulary for TOEFL /

Certainty and Doubt

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1-
certainty
2-
doubt
3-
confusion
4-
probability
5-
probable
6-
to suspect
7-
to assure
8-
to hesitate
9-
conviction
10-
to guarantee
11-
to ensure
12-
to expect
13-
speculative
14-
concrete
15-
undeniable
16-
debatable
17-
inevitable
18-
bound
19-
tentative
20-
convinced
21-
set
22-
inconclusive
23-
presumably
24-
to assume
25-
assumption
26-
decidedly
27-
supposedly
28-
doubtful
29-
dubious
certainty
noun
c
s
e
ɜ
r
r
t
t
ai
ə
n
n
t
t
y
i
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the state of being sure about something, usually when there is proof

doubt
example
Example
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Her certainty in her ability to complete the marathon came from months of dedicated training.
The scientist presented the results with certainty, as the experiments had been thoroughly tested.

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
doubt
noun
d
d
o
a
u
ʊ
b
t
t

a feeling of disbelief or uncertainty about something

certainty

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
confusion
confusion
noun
c
k
o
ə
n
n
f
f
u
ju
s
ʒ
io
ə
n
n

a state of being confused and not having a clear understanding of an action, behavior, etc.

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
probability
noun
p
p
r
r
o
ɑ
b
b
a
ə
b
b
i
ɪ
l
l
i
ə
t
t
y
i

the likelihood or chance of an event occurring or being true

improbability

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
probable
probable
Adjective
p
p
r
r
o
ɑ
b
b
a
ə
b
b
ə
l
l
e

having a high possibility of happening or being true based on available evidence or circumstances

improbable

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to suspect
to suspect
Verb
s
s
u
ə
s
s
p
p
e
ɛ
c
k
t
t

to think that something is probably true, especially something bad, without having proof

Grammatical Information:

transitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to assure
Verb
a
ə
ss
ʃ
u
ʊ
r
r
e

to make someone feel confident or certain about someone or something

Grammatical Information:

ditransitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to hesitate
Verb
h
h
e
ɛ
s
z
i
ə
t
t
a
t
t
e

to pause before saying or doing something because of uncertainty or nervousness

Grammatical Information:

intransitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
conviction
noun
c
k
o
ə
n
n
v
v
i
ɪ
c
k
t
ʃ
io
ə
n
n

a belief or opinion that is very strong

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to guarantee
Verb
g
g
ua
ɛ
r
r
a
ə
n
n
t
t
ee
i

to make sure that something will occur

Grammatical Information:

transitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to ensure
to ensure
Verb
e
ɛ
n
n
s
ʃ
u
ʊ
r
r
e

to make sure that something will happen

Grammatical Information:

transitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to expect
Verb
e
ɪ
x
ks
p
p
e
ɛ
c
k
t
t

to think or believe that it is possible for something to happen or for someone to do something

Grammatical Information:

transitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
speculative
speculative
Adjective
s
s
p
p
e
ɛ
c
k
u
j
ə
l
l
a
ə
t
t
i
ɪ
v
v
e

according to opinions or guesses instead of facts or evidence

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
concrete
Adjective
c
k
o
ɑ
n
n
c
k
r
r
e
i
t
t
e

according to facts instead of opinions

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
undeniable
undeniable
Adjective
u
ə
n
n
d
d
e
ɪ
n
n
ia
aɪə
b
b
ə
l
l
e

clearly true and therefore impossible to deny or question

deniable

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
debatable
Adjective
d
d
e
ə
b
b
a
t
t
a
ə
b
b
ə
l
l
e

subject to argument or disagreement

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
inevitable
inevitable
Adjective
i
ɪ
n
n
e
ɛ
v
v
i
ə
t
t
a
ə
b
b
ə
l
l
e

unable to be prevented

evitable

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
bound
Adjective
b
b
o
a
u
ʊ
n
n
d
d

likely to happen or sure to experience something

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
tentative
Adjective
t
t
e
ɛ
n
n
ə
t
t
a
ɪ
t
i
v
v
e

not firmly established or decided, with the possibility of changes in the future

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
convinced
Adjective
c
k
o
ə
n
n
v
v
i
ɪ
n
n
c
s
e
d
t

having a strong belief in something

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
set
Adjective
s
s
e
ɛ
t
t

prepared or likely prepared for something

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
inconclusive
Adjective
i
ɪ
n
n
c
k
o
ə
n
n
c
k
l
l
u
u
s
s
i
ɪ
v
v
e

not producing a clear result or decision

conclusive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
presumably
Adverb
p
p
r
r
e
ə
s
z
u
u
m
m
a
ə
b
b
l
l
y
i

used to say that the something is believed to be true based on available information or evidence

Grammatical Information:

adverb of manner

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
to assume
to assume
Verb
a
ə
ss
s
u
u
m
m
e

to think that something is true without having proof or evidence

Grammatical Information:

transitive

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
assumption
noun
a
ə
ss
s
u
ə
m
m
p
p
t
ʃ
io
ə
n
n

an idea or belief that one thinks is true without having a proof

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
decidedly
Adverb
d
d
e
ɪ
c
s
i
d
d
e
ə
d
d
l
l
y
i

in a way that is certain and beyond any doubt

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
supposedly
Adverb
s
s
u
ə
pp
p
o
s
z
e
ə
d
d
l
l
y
i

used to suggest that something is assumed to be true, often with a hint of doubt

Grammatical Information:

adverb of manner

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
doubtful
Adjective
d
d
o
a
u
ʊ
b
t
t
f
f
u
ə
l
l

improbable or unlikely to happen or be the case

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun
dubious
dubious
Adjective
d
d
u
u
b
b
iou
s
s

causing doubt or suspicion

Word Family

certain

Adjective

certainty

Noun

uncertainty

Noun

uncertainty

Noun

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