Pronunciation: (stub'urn),[key] —adj. 1. unreasonably obstinate; obstinately unmoving: a stubborn child. 2. fixed or set in purpose or opinion; resolute: a stubborn opponent of foreign aid. 3. obstinately maintained, as a course of action: a stubborn resistance. 4. difficult to manage or suppress: a stubborn horse; a stubborn pain. 5. hard, tough, or stiff, as stone or wood; difficult to shape or work.