tentative

/ˈten.t̬ə.t̬ɪv/
not definite or certain because you may want to change it later

not behaving or done with confidence 踌躇的；犹豫不定的；不果断的 SYN hesitant
a tentative greeting
怯声怯气的问候
I’m taking the first tentative steps towards fitness.
我试探性地开始实施健身计划。