tentative

adjective

1. of the nature of or made or done as a trial, experiment, or attempt; experimental: a tentative report on her findings.
2. unsure; uncertain; not definite or positive; hesitant: a tentative smile on his face.

adjective

1. provisional or experimental; conjectural
2. hesitant, uncertain, or cautious

adj.1580s, from Medieval Latin tentativus “trying, testing,” from Latin tentatus, past participle of tentare “to feel, try,” (variant of temptare “to feel, try, test”). Related: Tentatively.