unmistrustfuladj.
/(ˌ)ʌnmɪsˈtrʌs(t)f(ᵿ)l/, U.S. /ˌənmɪsˈtrəs(t)f(ə)l/ Now rare.
Not mistrustful; trusting.
ΘΚΠ
the mind > mental capacity > belief > belief, trust, confidence > act of convincing, conviction > [adjective] > accepting without question
mistrustless1586
unsuspicious1586
unmistrustful1587
unmistrusting1595
unsuspecting1595
unsuspicious1595
suspectless1605
implicit faith1610
distrustless1611
confidenta1616
suspicionlessc1650
undistrustful1654
unspeculative1660
unquestioning1697
unsuspectful1781
pin-faith1800
questionless1821
unspeculating1828
unsceptical1851
round-heeled1920
pistic1923
1587 A. Day Longus's Daphnis & Chloe sig. B2 Chloe..perceiued yet his sodaine vanishment, & was not vnmistrustfull at all, of his present harme.
1594 L. Lewkenor tr. O. de la Marche Resolued Gentleman f. 13 Hauing..spent the poasting yeeres of vnmistrustfull youth, either in the vniuersities at home, or in trauayles, or the warres abrode.
a1774 A. Tucker Light of Nature Pursued (1777) III. iv. 285 A prospect of futurity and unmistrustful Hope in the divine Goodness.
1850 M. C. Clarke Girlhood of Shakespeare's Heroines (1974) I. i. 14 The blessed unmistrustful serenity of friendship which had till now formed his chief happiness.
1901 K. Snowden Barbara West xi. 94 Her conversation appeared an unmistrustful showing of her real self to him.
1990 Independent (Nexis) 2 Nov. 16 An exclamation of unmistrustful wonder.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online March 2022).
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adj.1587