1. In a way that shows or expresses something clearly and openly; by means of demonstration or proof.
2. In a way that is marked by or given to open display of emotion or affection.

Examples

• She demonstratively applauded the performer, standing and cheering loudly.
• The scientist demonstratively proved the hypothesis through a series of careful experiments.
• He was demonstratively affectionate with his children, hugging and kissing them frequently.
• The evidence demonstratively showed that the defendant was guilty.
• She demonstratively rejected the proposal by walking out of the meeting.
• The crowd demonstratively expressed their disapproval with boos and hisses.