IPA: /ˈmɪs.trʌst.fəl.nəs/
KK: /mɪsˈtrʌstfəl/
The condition of being suspicious or having doubts about someone or something.
Her mistrustfulness made it hard for her to form new friendships.
Mistrustfulness → It is formed from "mis-" (meaning wrongly or badly), "trust" (from Old French *troster*, meaning to rely on or have confidence in), and "-fulness" (meaning the state of being full of). The word "mistrustfulness" means the state of being full of wrong or bad trust, or a lack of confidence in others.
Think of 'mis-' meaning wrongly, and 'trust' as relying on someone. This helps you remember that 'mistrustfulness' refers to the state of having a wrong or bad sense of trust.