1. faithful to one's sovereign, government, or state: a loyal subject.
2. faithful to one's oath, commitments, or obligations: to be loyal to a vow.
3. faithful to any leader, party, or cause, or to any person or thing conceived as deserving fidelity: a loyal friend.
4. characterized by or showing faithfulness to commitments, vows, allegiance, obligations, etc.: loyal conduct.
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If I chose you out of 320 million people to potentially be the second most powerful person on Earth would you back-stab me two years later?