1. the quality of being uncomfortably warm and humid

Examples

• The mugginess made it difficult to sleep without air conditioning.
• After the rain, the mugginess in the air was almost unbearable.
• We escaped the mugginess of the city by heading to the mountains.
• The mugginess of the greenhouse made her clothes stick to her skin.
• Despite the early hour, the mugginess suggested it would be a hot day.
• The mugginess lifted once the storm passed through.