1. extremely hot and humid in a way that makes breathing difficult
2. preventing freedom of expression or development; oppressive

Examples

• The stifling heat made it impossible to sleep without air conditioning.
• We opened all the windows to escape the stifling atmosphere in the room.
• The stifling humidity during summer makes outdoor activities unbearable.
• She felt trapped by her parents’ stifling rules and expectations.
• The stifling bureaucracy prevented any real progress on the project.
• His creativity flourished once he escaped the stifling corporate environment.
• The stifling air in the basement made everyone feel drowsy.