Uncertain Uncertain synonyms unsure uncertain and unsure unsettled uncertain and unsettled dubious uncertain and dubious changeable uncertain and changeable doubtful uncertain and doubtful unpredictable uncertain and unpredictable undetermined uncertain and undetermined unreliable uncertain and unreliable ambiguous uncertain and ambiguous vague uncertain and vague Full list of synonyms (1993) Uncertain antonyms sure uncertain and sure certain uncertain and certain predictable uncertain and predictable settled uncertain and settled definite uncertain and definite unchanging uncertain and unchanging clear uncertain and clear trustworthy uncertain and trustworthy reliable uncertain and reliable determined uncertain and determined Full list of antonyms (170) Share this picture Share this image Share this picture Share this image