横柄に の訳語→ bossily impertinently
決定的に の訳語→ conclusively crucially definitively fatefully terminally unequivocally
高飛車に の訳語→ aggressively haughtily highhandedly
断固として の訳語→ forbidding stoutly sturdily unswervingly
断定的に の訳語→ assertively decisively
否応なしに の訳語→ compulsively imperatively inevitable perforce strongly willy-nilly