The phrase "seem huge" can be replaced by several synonyms to add variety and enhance the writing. Some alternatives could be "appear mammoth," "give the impression of being immense," or "look gargantuan." Other options include "come across as colossal," "strike one as vast," or "present itself as oversized." Additionally, "seem enormous," "perceive as grandiose," or "exude largeness" are also suitable replacements. These synonyms can be used to describe anything from physical objects to abstract ideas, giving the written text more depth and complexity.