is a specific kind of: trait.

is a broader term that covers: possession, self-command, self-control, self-possession, self-will, will power, willpower | steadiness | sturdiness | stiffness | bullheadedness, obstinacy, obstinance, pigheadedness, self-will, stubbornness | single-mindedness | adamance, obduracy, unyieldingness | decision, decisiveness | determination, purpose | steadfastness.

is the opposite of: irresoluteness, irresolution.

derivation: resolute, unhesitating | fast, firm, loyal, truehearted | resolute | firm, steadfast, steady, stiff, unbendable, unfaltering, unshakable, unwavering.