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Definition of tentative : 1. An essay; a trial; an experiment.
2. Of or pertaining to a trial or trials; essaying; experimental.

Synonyms:

inclined to think/believe/agree etc., provisory, sceptical, not final, ill at ease, pendulous, unfinished, timid, provisionary, decide, retiring, bewildered, unsure of yourself, on trial, indefinite, open to consideration, halting, rough, start, unperfected, unpolished, doubtful, iffy, lost, questioning, unconfirmed, limited, in question, dubious, dubitable, preliminary, subject, unsettled, vacillatory, probationary, sketchy, subject to change, inhibited, makeshift, vacillant, not settled

contingent, conditional, provisional, dependent

shrinking, uncertain, ambivalent, undecided, shifty, watery, inconsistent, hesitant, dillydallying, infirm, shy, indecisive, irresolute, irresponsible, vacillating, unsure, insipid, flitting, yellow, weak, impulsive, capricious, volatile, changeable, erratic, double-minded, unwilling, shilly-shally, unresolved, halfhearted, fly-by-night, spineless, fickle, undependable

moot, mysterious, arguable, contestable, disputable, confused, insecure, deniable, controversial, questionable, debatable, unconvinced, vague, precarious

experimental, benchmarked, unproven, investigative, trial, probative, empirical, test, hit-or-miss, analytical, unverified

Usage examples:

• The tentative playing is like the process of " fixing" against sensitiveness to lights; and the final work with the printed music is the retouching. - "Piano Playing With Piano Questions Answered", Josef Hofmann.
• We have only begun to live; and we live in the lower ranges of our nature, or perhaps we have touched life on a higher level in some tentative sort of way. - "Our Unitarian Gospel", Minot Savage.
• Returning to his apartment, the young man held a brief interview with de Windt, who said little, but studied the boy's face anxiously; and, though he attempted neither advice nor remonstrance, finally made a tentative suggestion about accompanying his friend. - "The Genius", Margaret Horton Potter.