Adverbs for Inflexible

obstinately; tenaciously; resolutely; determinedly; stubbornly; unreasonably; consistently; immovably; indomitably; unflinchingly; rigidly; obdurately; stiffly; arrogantly; austerely; autocratically; brutally; strictly; imperiously; domineeringly; tyrannically; sharply; rigorously; hardly; haughtily; inexorably; peremptorily; severely; uncompromisingly; unsparingly; sternly; hatefully; notoriously; intolerably; heartbreakingly.