trustworthy UK /ˈtɹʌst.wɜː.ði/US /ˈtɹʌstˌwɜɹ.ði/ adjective1 •Deserving of trust, reliable.The storage of cryptographic secrets is one of the paramount requirements in building trustworthy systems. — 2014 formsmore trustworthy · trustworthier · most trustworthy · trustworthiest