1. in a way that is definite and unmistakable; clearly
2. in a determined or resolute manner

Examples

• The weather was decidedly cold for this time of year.
• She was decidedly unhappy with the results.
• His performance was decidedly better than last week.
• The room felt decidedly warmer after we closed the windows.
• He spoke decidedly, leaving no room for argument.
• The new policy is decidedly unpopular among students.
• She decidedly refused to participate in the project.