Stalwart
Part of speech: adjective
Definition: Firmly built. Courageous.
Part of speech: noun
Definition: one who has a strong build one who firmly supports a cause
Resolute
Part of speech: adjective
Definition: Firm, unyielding, determined. For example, she was 'resolute' in her determination to resist his romantic advances.
Example sentence: On foreign policy, President Obama has kept our nation safe from terrorism and restored our standing in the world. When it comes to one of our closest allies - Israel - President Obama has been resolute.