decision

behest, charge, commandment, decree, dictate, directive, edict, instruction, mandate, order, word

last word, say-so

adjudication, disposition, doom, finding, ruling, sentence

choice, option, selection

consensus

belief, conviction, eye, feeling, mind, notion, persuasion, sentiment, view

doggedness, obduracy, obdurateness, obstinacy, obstinateness, perseverance, persistence, persistency, stubbornness, tenaciousness, tenacity

certainty, certitude, confidence, sureness

alacrity, eagerness, gameness, readiness

backbone, fortitude, grit, iron, pluck, sand