adjective
    
    [more ~; most ~] :not certain: such as
    
    not exactly known or decided :not definite or fixed
    
    
    
    
    
    not sure :having some doubt about something
    
    
    
    
    
    
    
    not definitely known
    
    
    
    
    
    likely to change :not constant or dependable
    
    
    
    
    
    
    
    in no uncertain terms
    
    in a very clear and direct way