Find descriptive alternatives for know. We Don't Know synonyms. 103 synonyms for know: have knowledge of, see, understand, recognize, perceive, be aware of, be conscious of, be acquainted with, recognize, associate with.... What are synonyms for doesn't know that? Top synonyms for we don't know (other words for we don't know) are just in case, in case and in the event. This is the British English definition of I don’t know.View American English definition of I don’t know.. Change your default dictionary to American English. Top synonyms for don't know (other words for don't know) are have no idea, can't tell and donno. Synonyms for don't know include don't comprehend, don't realize, don't recognize and don't understand. Antonyms for doesn't know that. Find more similar words at wordhippo.com! Definition and synonyms of I don’t know from the online English dictionary from Macmillan Education.. Don't Know synonyms. I Don't Know synonyms. Find descriptive alternatives for not know. Synonyms for know at Thesaurus.com with free online thesaurus, antonyms, and definitions. Synonyms for not know at Thesaurus.com with free online thesaurus, antonyms, and definitions. Top synonyms for i don't know (other words for i don't know) are have no idea, i have no idea and do not ask me. Synonyms for doesn't know that in Free Thesaurus. Synonyms for 'I don’t know': not that I know of, don’t ask me, your guess is as good as mine, (that’s a) good question, I couldn’t tell you