When it comes to describing someone or something that lacks motivation, there are many synonyms available that can help you express your thoughts more accurately. For instance, you might use words such as indifferent, apathetic, lethargic, uninspired, uninterested, listless, disengaged, and passive to suggest that someone is un-motivated. These words indicate a lack of drive or initiative, and can be used in a variety of contexts. Whether you're talking about a person who seems uninterested in their job, or a project that lacks the spark to get it off the ground, having a range of synonyms for "un-motivated" at your disposal can help you express your ideas more effectively.