The term "don't-know" refers to a lack of knowledge or awareness about a particular thing. This phrase can often be replaced by various synonyms such as "unsure", "ignorant", "clueless", "uncertain", or "puzzled". These words all describe a state of confusion or unclear understanding about something. Other synonyms for "don't-know" include "confused," "doubtful," "uninformed," "unaware," and "unknowing". Each of these words conveys a sense of not being entirely certain or informed about a particular matter. By using these synonyms in place of "don't-know," speakers can express their uncertainty with more nuance and clarity.