From Longman Dictionary of Contemporary Englishbe unclear about somethingbe unclear about somethingCLEAR/EASY TO UNDERSTANDto not understand something clearly I’m rather unclear about what I’m supposed to be doing here. → unclear
Examples from the Corpus
be unclear about something• In those days we still were unclear about how the work would develop and whether we would move towards independence or not.• Most of the applicants I interview either do not know about it or are unclear about the details.• Many young people - I am in no way blaming them - are unclear about their personal plans.• If not, those involved will be unclear about what is expected and monitoring and control will be ineffective.• Most workers were unclear about what their marginal tax rates were, and consequently did not have any very clearly calculated response. 