- 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.
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- 2unsure (of yourself) lacking confidence in yourself Like many women, deep down she was unsure of herself. opposite sure
Check pronunciation: unsure