simple past tense and past participle of trust
"After years of keeping our secrets, we knew she was a trusted confidant who would never betray us."
In plain English: To trust someone means to believe they will do what they say and not hurt you.
"My grandmother trusted me to watch her house while she was away."
reliable
"After years of delivering packages on time, he became a trusted courier for the entire neighborhood."
In plain English: Trusted means someone you can rely on to keep your secrets and do what they say they will.
"She is the only person I trust with my secrets."
Derived from Old French trustier, which comes from Latin credere meaning "to believe." The term originally signified being relied upon or having confidence placed in someone.