The phrase "seldom seen" can be replaced with a variety of synonyms that convey the same meaning. Some synonyms for this phrase include "rarely witnessed," "infrequently observed," "uncommonly viewed," and "occasionally caught sight of." Other possible alternatives include "scarce surveyed," "hardly noticed," "sporadically seen," and "scarcely beheld." All these synonyms suggest that something is not often seen or only appears once in a while. By using these phrases instead of "seldom seen," writers can add variety to their writing and avoid repetition while still conveying the intended meaning.