IPA: /ˈtrʌstfəl/
KK: /trʌstfəl/
Willing to believe in the honesty or reliability of others; having a trusting nature.
She is very trustful and always believes what her friends tell her.
Comparative: more trustful
Superlative: most trustful
Trustful → It is formed from "trust" (from Old Norse *traust*, meaning confidence or reliance) and "-ful" (meaning full of). The word "trustful" means full of trust or confidence in someone or something.
Think of being 'full of trust' — 'trust' means confidence, and '-ful' indicates abundance.