tentative
adjective uk/ˈten.tə.tɪv/ us/ˈten.t̬ə.t̬ɪv/
（计划、想法、建议、行动等）试验（性）的，试探（性）的，暂时的
(of a plan or idea) not certain or agreed, or (of a suggestion or action) said or done in a careful but uncertain way because you do not know if you are right
I have tentative plans to take a trip to Seattle in July. 我暂定7月份去西雅图旅行。
tentatively
adverb uk/ˈten.tə.tɪv.li/ us/ˈten.t̬ə.t̬ɪv.li/
犹豫地；迟疑不决地
If you do or say something tentatively, you do or say it in an uncertain way.