1. in a stubborn, inflexible, or unyielding manner; refusing to change one's mind or opinion despite evidence or persuasion
Usage: formed from the adjective 'hardheaded' + adverbial suffix '-ly'

Examples

• She hardheadedly refused to listen to any advice about changing her approach.
• He hardheadedly insisted on his original plan, even after the data showed it would fail.
• The manager hardheadedly rejected all suggestions for improvement from the team.
• They hardheadedly clung to their outdated beliefs despite modern evidence.
• He argued hardheadedly against the proposal without considering the benefits.