1. in a negative way; expressing denial, refusal, or disagreement
2. in a harmful or undesirable way
3. with a pessimistic or critical attitude

Examples

• She responded negatively to the proposal.
• The medication negatively affected his sleep.
• He always thinks negatively about new changes.
• The test results came back negatively.
• The particle is negatively charged.
• The review negatively impacted sales.
• She reacted negatively to the criticism.