From Longman Dictionary of Contemporary Englishtrustworthytrust‧wor‧thy /ˈtrʌstˌwɜːði $ -ɜːr-/ ●○○ adjective TRUSTable to be trusted and depended on —trustworthiness noun [uncountable]THESAURUSpeopletrustworthy especially written if someone is trustworthy, you can trust them because they are honestMany people do not see politicians as trustworthy.reliable someone who is reliable can be trusted to do what they say they will do and not make any mistakesa reliable employeeWe need someone who is 100% reliable.responsible someone who is responsible can be trusted to behave in a sensible waySam’s a good babysitter – he’s responsible and the kids like him. a responsible adultdependable someone who is dependable can be trusted to do what you need or expectBritain is our most dependable ally.steady someone who is steady is sensible and you can depend on themHe’s only sixteen, but he’s steady and reliable.loyal someone who is loyal can be trusted to always give help or support to their friends, their country, their political party etcShe is fiercely loyal to her family.He is one of the party’s most loyal supporters.faithful someone who is faithful stays loyal to a person, belief, political party etc, and continues to support them, even in difficult situationsDaniel had been a faithful friend.a faithful member of the Communist Partycan rely/depend on somebody if you can rely or depend on someone, you can be sure that they will do what you want or need them to doDon’t worry about a thing – you can depend on me.Patients rely on doctors to help them make the right decisions about their health care.thingsreliable/dependable able to be trusted to do what you want, or to be accurateThe Boeing is a very reliable plane. a dependable supply of oilreliable economic forecastsHow can we be sure that his evidence is reliable?trustworthy if something is trustworthy, you know that it is true or accuratea trustworthy source of information a trustworthy guidecan rely/depend on something if you can rely or depend on something, you can be sure that they will do what you want or need them to doI need a car that I can rely on in all weathers.
Examples from the Corpustrustworthy• But then no one should ever expect a criminal organization to be trustworthy.• From then on life is marked by the search for an answer which will meet the need and prove trustworthy.• It would have to be an evil-beneath-the-surface person who seems to be trustworthy.• Most of our employees are pretty trustworthy, I think.• Those who advocate total manipulation urge that a trustworthy mode of communication is always open to cheating.• Are you a hard worker; are you loyal, trustworthy or faithful?• If you want your mom to trust you, you have to be a trustworthy person.• Do the best you can to draw up a complete and trustworthy plan.• We got the information from a trustworthy source.From Longman Business Dictionarytrustworthytrust‧wor‧thy /ˈtrʌstˌwɜːDi-ɜːr-/ adjective a person or organization that is trustworthy can be trusted and depended uponThe staff are honest, trustworthy, intensely loyal and hard-working. —trustworthiness noun [uncountable]The brand conveyed quality, modernity and trustworthiness.