"Not looked after" is a phrase that typically describes a situation where something or someone has not been given sufficient attention or care. There are several synonyms that can be used to replace this phrase, depending on the context. Some of these synonyms include "neglected," "unattended," "ignored," "abandoned," "unprotected," "unwatched," "disregarded," and "forgotten." These words all convey a sense of neglect or lack of care, and can be used to describe everything from children who are not taken care of by their parents to neglected pets or abandoned properties. By using these synonyms, you can add variety and depth to your writing, while still conveying the same basic idea.