When something is described as "ill matched," it typically means that it is not well-suited or poorly matched. Synonyms for this term include incompatible, mismatched, unsuitable, incongruous, discordant, inappropriate, out of place, unharmonious, and awkward. In the context of people, "ill matched" describes a couple or two individuals who are not suited for each other due to differences in temperament, interests, or values. It can also describe objects that clash in terms of style, design, or functionality. In any case, the synonym portrays a situation where the two things in question don't match well.