The phrase "forlorn of" refers to something or someone that is abandoned, or left without hope or comfort. Synonyms for this phrase might include "desolate," "bereft," "abandoned," "isolated," or "lonely." Each of these words carries a slightly different connotation, but they all describe a sense of loss or emptiness. For example, "desolate" might be used to refer to a place that is barren or uninhabitable, while "lonely" might be used to describe a person who is lacking companionship or support. Ultimately, the choice of synonym will depend on the intended tone and context of the sentence.