loyal - faithful and dependable

trustworthy

trust‧wor‧thy /ˈtrʌstˌwɜːði $ -ɜːr-/ BrE AmE adjective
[Word Family: adjective: ↑trusting, ↑trustworthy ≠ ↑untrustworthy, ↑trusty, ↑distrustful, ↑mistrustful; noun: ↑trust ≠ ↑distrust ≠ ↑mistrust, ↑trustee, ↑trusteeship, ↑trustworthiness; verb: ↑trust ≠ ↑distrust ≠ ↑mistrust]
able to be trusted and depended on
—trustworthiness noun [uncountable]
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THESAURUS
■ people
▪ trustworthy especially written if someone is trustworthy, you can trust them because they are honest: Many 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 mistakes: a reliable employee | We need someone who is 100% reliable.
▪ responsible someone who is responsible can be trusted to behave in a sensible way: Sam’s a good babysitter – he’s responsible and the kids like him. | a responsible adult
▪ dependable someone who is dependable can be trusted to do what you need or expect: Britain is our most dependable ally.
▪ steady someone who is steady is sensible and you can depend on them: He’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 etc: She 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 situations: Daniel had been a faithful friend. | a faithful member of the Communist Party
▪ can 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 do: Don’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.
■ things
▪ reliable/dependable able to be trusted to do what you want, or to be accurate: The Boeing is a very reliable plane. | a dependable supply of oil | reliable economic forecasts | How can we be sure that his evidence is reliable?
▪ trustworthy if something is trustworthy, you know that it is true or accurate: a trustworthy source of information | a trustworthy guide
▪ can 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 do: I need a car that I can rely on in all weathers.