- 1not certain of something; having doubts unsure about/of something There were a lot of things I was unsure about. unsure how, what, etc… I was unsure how to reply to this question. unsure of/as to how, what, etc… He was unsure of what to do next. They were unsure as to what the next move should be.
- 2unsure (of yourself) lacking confidence in yourself Like many women, deep down she was unsure of herself. opposite sure
NAmE//ʌnˈʃʊr//, NAmE//ʌnˈʃər//[not before noun]