1. in a way that shows disapproval or criticism
2. in a way that is disadvantageous or harmful

Examples

• The critics reviewed the movie unfavorably.
• Her proposal was received unfavorably by the committee.
• The weather conditions affected the crops unfavorably.
• The new policy was viewed unfavorably by most employees.
• His performance was compared unfavorably to his predecessor’s.
• The economic changes impacted small businesses unfavorably.