1. scattered or dispersed; no longer concentrated or gathered together
2. indulging excessively in sensual pleasures; living an unrestrained lifestyle
Usage: often implies moral disapproval

Examples

• The morning fog had dissipated by noon.
• His energy was completely dissipated after the long hike.
• The crowd slowly dissipated after the concert ended.
• The heat from the fire dissipated quickly in the cold air.
• He led a dissipated life, spending his inheritance on gambling and parties.
• The dissipated young nobleman was known for his wild behavior.
• Her parents worried about her dissipated lifestyle in college.