Уверенность и сомнение - Uncertainty

generally perceived to exist or be the case despite being uncertain

признанный

used to say that something is true according to what people say, although it is uncertain

по слухам

to make something, particularly a belief or idea, less certain

шата́ть

uncertain about the exact details of something

неопределенный

used to indicate a degree of expectation regarding something that is likely to happen

должен

in a way or by some method that is not known or certain

таким образом

in some obscure manner or by some unspecified means that one does not know or understand thoroughly

некоторым образом

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

предположительно

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

предварительный

in a way that is not certain or definite and might be changed later

предварительно

‌used to express that no decision is made or no opinion is formed about something due to uncertainty

used to imply that even when something seems certain or likely to happen, there are many opportunities for it to go wrong or for unexpected events to intervene before it is actually achieved

used to convey that something cannot happen under any given circumstances

not definitively known or decided

неопределённый

something about which one cannot be certain

неопределенность

not exactly known or expressed, often leading to confusion or ambiguity

неясный

having doubts about the validity or credibility of something

недоверчивый

having a low chance of happening or being true

маловероятный

having doubts about or no confidence in someone or something

неуверенный

to become less resolved or determined

ослабевать

used to express an opinion about which one is not certain

бы

used to say that one can never be sure of something