1. in a manner that is annoying, stubborn, or difficult to deal with; obstinately or perversely
Usage: informal; often used for emphasis

Examples

• The old machine was cussedly difficult to repair.
• He cussedly refused to admit he was wrong.
• The weather turned cussedly cold overnight.
• She cussedly insisted on doing things her own way.
• The problem proved cussedly resistant to simple solutions.