Definition of: trueblue

(tr′bl′) noun
1. Originally, a fast blue color or dye; hence, constancy or unchangingness.
2. In the 17th century, a Scotch Presbyterian or Covenanter, so called from the blue adopted as the distinctive color of his political party.
3. A person of uncompromising faithfulness or loyalty as to party, sect, friendship, or principle.
—adjective Staunch; faithful; dependable; genuine.