true-blue
adjective
• unwavering in one's commitment; extremely loyal.
• "I'm a dyed-in-the-wool, true-blue patriot"
Similar:
staunch,
loyal,
faithful,
stalwart,
committed,
card-carrying,
confirmed,
dyed-in-the-wool,
devoted,
dedicated,
firm,
steadfast,
dependable,
reliable,
trusty,
steady,
constant,
unswerving,
unwavering,
unfaltering,
deep-dyed,
• real; genuine.
• "the tournament was won by a team of true-blue amateurs"
true-blue
noun
• a staunchly loyal supporter of the Conservative Party.