: not certain about something : not sure
He was unsure whether she had reserved a room or not.
I'm unsure about the offer.
He seemed unsure of what to say.
We're unsure (of) how to proceed.
Cite this Entry
“Unsure.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/unsure. Accessed 23 Jun. 2026.
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