Synonyms and antonyms of To make something less certain in American Thesaurus

call/bring/throw something into question ()

to make something seem less certain

shake someone’s belief/confidence/faith ()

to make someone doubt something that they were sure was true

cast doubt on something ()

to make something seem less certain, good, or real

call something into question/doubt ()

to make something seem less certain

sow fear/doubt/confusion etc. ()

to make people feel afraid, doubtful, confused, etc.