unsure - definition and synonyms

 
adjective 

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/ʌnˈʃʊə(r)/
  1. not certain about something

    If you’re unsure, ask the customer to spell their name.

    unsure of/about:

    Police were unsure of the motive for the killing.

    unsure whether/if:

    I was unsure whether to leave.

    unsure how/what/why etc:

    She was unsure how to tell him.