1610s, from Latin haesitantia "action of stammering," from haesitantem (nominative haesitans) "stammering," present participle of haesitare "to stick fast, stammer" (see hesitation).
Entries linking to hesitancy
hesitation n.
c. 1400, from Old French hesitacion or directly from Latin haesitationem (nominative haesitatio) "a hesitation, stammering," figuratively "irresolution, uncertainty," noun of action from past participle stem of haesitare "stick fast, remain fixed; stammer in speech," figuratively "hesitate, be irresolute, be at a loss, be undecided," frequentative of haerere (past participle haesus, first person perfect indicative haesi) "to adhere, stick, cling."
This is said by Watkins to be from PIE root *ghais- "to adhere, hesitate" (source also of Lithuanian gaišti "to delay, tarry, be slow"), but some linguists reject the proposed connection; de Vaan offers no etymology.
hesitance n.
c. 1600, from Latin haesitantia (see hesitancy).
hesitant adj.
1640s, probably a back-formation from hesitancy, or else from Latin haesitantem. Related: Hesitantly.