Synonyms and antonyms of Certain about something in British Thesaurus

certain (adjective)

having no doubts that something is true

sure (adjective)

certain that something is real, true, or correct

positive (adjective)

completely certain

sure (adjective)

certain about what you feel, what you want, or what you have decided

definite (adjective)

certain

confident (adjective)

certain that something will happen or be successful

convinced (adjective)

certain that something is true

unquestioning (adjective)

never doubting or criticizing

satisfied (adjective)

if you are satisfied that something is true or correct, you do not need any more proof

dogmatic (adjective)

so sure that your beliefs and ideas are right that you expect other people to accept them

assured (adjective)

confident and certain

assuredly (adverb)

formal certainly

decidedly (adverb)

in a way that shows you are very certain about something

flat out (mainly American)

mainly American completely and without doubt

implicit (adjective)

without any doubts or questions

paid-up (adjective)

British used for emphasizing that someone has very strong beliefs of a particular type

positively (adverb)

in a confident or definite way

sure (adjective)

confident and not in any doubt about something

unfaltering (adjective)

formal confident and strong because you believe your principles or actions are right