Coffee klatches can be described as a type of social gathering that involves drinking coffee and having conversations with friends or acquaintances. However, there are several antonyms for this term that are not as sociable. For example, solitude, isolation, and loneliness describe being alone without any social interaction. In contrast, a coffee klatch usually involves a group of people chatting and enjoying each other's company. Another antonym could be silence or quietness, as a coffee klatch often involves lively conversation and laughter. Lastly, an antonym for coffee klatch could be work or business, as a coffee klatch is typically not related to any professional or work-related activities.