tentative

adjective

1 a tentative arrangement | this can only be a tentative conclusion:

provisional, unconfirmed, unsettled, indefinite, pencilled in, preliminary, to be confirmed, TBC, subject to confirmation;

speculative, conjectural, untried, unproven, unsubstantiated;

exploratory, experimental, trial, test, pilot;

rare provisory, provisionary.

▷antonyms definite.

2 he eventually tried a few tentative steps around his hospital room:

hesitant, uncertain, cautious, unconfident, timid, hesitating, faltering, shaky, unsteady, halting;

wavering, unsure, doubtful, diffident;

informal iffy.

▷antonyms confident.

tentative Oxford Dictionary of English