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To be certain - synonyms or related words

be clear that


to feel confident and determined about a belief or decision



to feel certain about something

believe in

to feel confident that a person or organization is good or reliable

know your own mind

to be certain about what you like and what you want

swear to

to be completely certain of something

depend on

if you can depend on someone to do something, you are sure that they will do it

feel/know something in your bones

to feel certain about something, although you cannot explain or prove it

bet the farm

to be certain that something will happen or bring you success, especially when this makes you spend all your money on it


sea lion

in an online conversation, repeatedly asking a person questions which suggest that you are interested in what they are talking about, but are actually intended to annoy them

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