1. in a way that causes discomfort through being excessive or overwhelming
2. in a harsh, cruel, or unjustly severe manner

Examples

• The heat was oppressively humid that summer day.
• The silence in the room felt oppressively heavy.
• The government ruled oppressively, denying basic freedoms.
• The small apartment felt oppressively cramped.
• The boss managed the team oppressively, micromanaging every detail.
• The atmosphere in the courtroom was oppressively tense.
• The dictator oppressively controlled all media outlets.