2 firm or unwavering adherence to one's purpose acted with swift decision Synonyms of decision decidedness, determination, decisiveness, determinedness, firmness, granite, purposefulness, resoluteness, resolution, resolve, stick-to-itiveness Words Related to decision doggedness, obduracy, obdurateness, obstinacy, obstinateness, perseverance, persistence, persistency, stubbornness, tenaciousness, tenacity; certainty, certitude, confidence, sureness; alacrity, eagerness, gameness, readiness ...