Definition of unmistrustful in English:
unmistrustful
adjective
rare
Not mistrustful; trusting.
Origin
Late 16th century; earliest use found in Angell Day (fl. 1563–1595), stationer and writer. From un- + mistrustful.
Pronunciation
unmistrustful
/(ˌ)ʌnmɪsˈtrʌs(t)f(ʊ)l/