tentative Synonyms

doubtful provisionary probationary provisional theoretic timid transitional trial uncertain vacillant vacillating teetering test temporary suppositional stuttering speculative shy shaky putative provisory vacillatory wavering weak investigational on the fence unproven unconvinced untested untried subject to confirmation subject to change unsure iffy unresolved working undecided uncommitted ambivalent milquetoast unproved unverified unconfirmed lacking confidence ad interim docimastic dubious empirical experiential experimental