Hesitant
来自Big Physics
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late Middle English: from Latin haesitant- ‘being undecided’, from the verb haesitare (see hesitate).
wiktionary
Borrowed from Latin haesitans, present participle of haesitare(“to stick fast, to hesitate”)
etymonline
hesitant (adj.)
1640s, probably a back-formation from hesitancy, or else from Latin haesitantem. Related: Hesitantly.