Advanced Vocabulary for TOEFL - Doubt and Certainty

to let something happen or exist

to make certain of or to guarantee something

to guess or deduce information through intuition or a sense of inner knowledge

to estimate something by calculating and guessing

to state an opinion, guess, suggestion, etc. even though there are chances of one being wrong

to hesitate or be dubious about doing something that one thinks might be wrong or immoral

to come to a conclusion without enough evidence

to give good reasons to justify a particular action

unquestionably true in a way that there is no need for proof

referring to something that has several possible meanings, often deliberately set that way

(of a statement or story) unlikely to be authentic, even though it is widely believed to be true

experiencing confusion

without a doubt

(of a situation, movie, etc.) having an unclear ending that makes it enticing

able to make decisions quickly and confidently

being convinced that everything one believes in is true and others are wrong

deliberately not having one obvious meaning and therefore open to interpretation, often intended to deceive

acting or talking with hesitation due to uncertainty or lack of confidence

true in a way that leaves no room for denial or disagreement

generally perceived to exist or be the case despite being uncertain

displaying forcefulness and determination

unable to decide between two opinions, possibilities, etc.

a feeling of hopefulness and confidence that makes one remain cheerful, especially in sad or unpleasant situations

the feeling of complete certainty

an idea that is based on guesswork and not facts

shyness due to a lack of confidence in oneself

a guess that is made according to one's experience or knowledge thus is more likely to be true

something that is assumed to be true or already decided upon before any evidence or arguments are presented

an unpleasant, sad, or difficult situation

a state of being perplexed or uncertain about how to proceed in a situation that is difficult

the lack of clear expression, knowing, describing, or decision