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

1580–90; < Medieval Latin tentātīvus, equivalent to Latin tentāt(us) (past participle of tentāre, variant of temptāre to test; see tempt) + -īvus -ive

tentatively, adverb
tentativeness, noun
nontentative, adjective
nontentatively, adverb
nontentativeness, noun
pretentative, adjective
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World English Dictionary
tentative (ˈtɛntətɪv)
1.  provisional or experimental; conjectural
2.  hesitant, uncertain, or cautious
[C16: from Medieval Latin tentātīvus, from Latin tentāre to test]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1580s, from M.L. tentativus "trying, testing," from L. tentatus, pp. of tentare "to feel, try," (variant of temptare "to feel, try, test"). Related: Tentatively.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My conducting is tentative and the musicians' response is halting and lumbered.
At the moment, however, leaders of the project expressed how tentative the five
  universities are in endorsing the approach.
With white satin pageant sashes, they stood at the edge of the dining room,
  more tentative than triumphant.
My tentative take is that there's an inchoate quality to their fears that's new.
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