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Essential Vocabulary for TOEFL - Certainty and Doubt

Here you will learn some English words about certainty and doubt, such as "doubt", "assure", "expect", etc. that are needed for the TOEFL exam.

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Essential Words Needed for TOEFL
certainty
[noun]

the state of being sure about something, usually when there is proof

Ex: certainty about the project 's success helped persuade others to invest in it .
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doubt
[noun]

a feeling of disbelief or uncertainty about something

Ex: The decision was made quickly , leaving no room doubt.
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confusion
[noun]

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

Ex: The new instructions were confusion as employees struggled to understand the changes .
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a feeling of hopefulness that derives from an optimistic attitude and mindset that allows one to see the bright side of things especially future events

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the likelihood or chance of an event occurring or being true

Ex: probability is essential in making informed decisions in gambling and finance .
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probable
[Adjective]

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

Ex: The archaeologist believes itprobable that the ancient ruins discovered belong to a previously unknown civilization .
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to think that something is probably true, especially something bad, without having proof

Ex: suspect the company may be hiding some important information .
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to assure
[Verb]

to make someone feel confident or certain about someone or something

Ex: The assured the child of their love and support , comforting them during a difficult time .
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to pause before saying or doing something because of uncertainty or nervousness

Ex: In the heated debate , the hesitated before addressing the controversial topic .
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the act of pausing before doing or saying something because one feels unsure

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a belief or opinion that is very strong

Ex: conviction in the power of education inspired many students to pursue higher goals .
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to make sure that something will occur

Ex: Adequate guarantees that the project will be completed on time and within budget .
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to ensure
[Verb]

to make sure that something will happen

Ex: The ensured the safety of the passengers during the storm .
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to expect
[Verb]

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

Ex: expects a promotion after all his hard work this year .
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speculative
[Adjective]

according to opinions or guesses instead of facts or evidence

Ex: She offered speculative explanation for his sudden disappearance , based on rumors she had heard .
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concrete
[Adjective]

according to facts instead of opinions

Ex: The success of the project was concrete planning and meticulous execution .
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undeniable
[Adjective]

clearly true and therefore impossible to deny or question

Ex: The results of the experiment undeniable, confirming the hypothesis .
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debatable
[Adjective]

subject to argument or disagreement

Ex: The fairness of the election process has been debatable topic for years .
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inevitable
[Adjective]

unable to be prevented

Ex: With tensions escalating between the two countries , war inevitable.
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bound
[Adjective]

likely to happen or sure to experience something

Ex: He was bound to encounter challenges during his journey, given the difficult terrain.
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tentative
[Adjective]

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

Ex: The company made tentative offer to the candidate , pending reference checks .
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convinced
[Adjective]

having a strong belief in something

Ex: She was convinced that they would find a solution soon.
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set
[Adjective]

prepared or likely prepared for something

Ex: After months of planning and rehearsals, the cast was set for the opening night of the play.
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inconclusive
[Adjective]

not producing a clear result or decision

Ex: The results of the experiment inconclusive, requiring further testing to reach a clear outcome .
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presumably
[Adverb]

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

Ex: The project deadline was extendedpresumably to allow more time for thorough research and development .
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to assume
[Verb]

to think that something is true without having proof or evidence

Ex: Right now , some team members assuming that the project deadline will be extended .
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an idea or belief that one thinks is true without having a proof

Ex: The decision relied on the assumption that funding would be approved.
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decidedly
[Adverb]

in a way that is certain and beyond any doubt

Ex: The changes in the design decidedly for the better .
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supposedly
[Adverb]

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

Ex: supposedly has insider information , but we should verify the facts before making any decisions .
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doubtful
[Adjective]

improbable or unlikely to happen or be the case

Ex: The explanation doubtful, considering all the facts .
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dubious
[Adjective]

causing doubt or suspicion

Ex: The companydubious financial practices raised concerns among investors .
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