Spread too thin is a phrase that means to have too many responsibilities or tasks that cannot be properly handled. Some synonyms for this phrase include overextended, overcommitted, overwhelmed, overworked, overloaded, and stretched thin. Being overextended refers to having too many obligations or duties beyond one's capacity. Overcommitted describes having promised to do more than can be realistically accomplished. Overwhelmed refers to being mentally or emotionally drained due to an excessive workload. Overloaded means being burdened with excessive work or information. Lastly, stretched thin refers to being overworked to the point of exhaustion. All of these synonyms embody the feeling of being spread too thin and highlight the importance of properly managing one's commitments.