loyal to the core

Related

ride-or-die · diehard · allegiance · oath · blood · backbone · sworn · trustworthy · stalwart · bedrock · honor · commitment · bonded · soldier · keeper · stand-by · heart · unshakeable

Opposites
faithfulness/allegiance

loyal to the coretraitorous

Guilty of betrayal

treacherous · disloyal · backstabbing · treasonous · faithless

depth of commitment

loyal to the corefair-weather friend

Ally only in prosperity

lukewarm · wavering · fickle · uncommitted · inconstant

Familiarity
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