adjective “uncertain”
 base form uncertain (more/most)
- not feeling sure about something; having doubts 
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 She felt uncertain about which dress to wear to the party.
 - likely to change, usually in a way that is not good 
The weather forecast is uncertain, so we might have to cancel the picnic.
 - (of an action) feeling unsure about the result 
She gave an uncertain smile, not sure if her joke was funny.