WordWeb Online

1. Worthy of trust or belief
   "a trustworthy report"; "an experienced and trustworthy travelling companion";
   - trusty, straight-up [informal], trustable
    
2. Taking responsibility for one's conduct and obligations
   "trustworthy public servants";
   - straight-up [informal], trustable

See also: authentic, creditworthy, dependable, faithful, fiducial, honest, honorable [US], honourable [Brit, Cdn], reliable, responsible, sure, true, trusted

Antonym: untrustworthy

Encyclopedia: Trustworthy