Tentative agreements, plans, or arrangements are not definite or certain, but have been made as a first step. Political leaders have reached a tentative agreement to hold a preparatory conference next month = provisional firm + tentatively ten·ta·tive·ly The next round of talks is tentatively scheduled to begin October 21st in Washington
If someone is tentative, they are cautious and not very confident because they are uncertain or afraid. My first attempts at complaining were rather tentative confident + tentatively ten·ta·tive·ly Perhaps, he suggested tentatively, they should send for Dr Band