The word "unsuggestible" refers to someone who is resistant to being influenced or persuaded. Some synonyms for this word include "unyielding," "unresponsive," "impenetrable," "uninfluenced," and "insusceptible." Other possible synonyms might include "unimpressionable," "inflexible," "immovable," or "uncompromising." These words all convey a similar sense of a person who is difficult to sway or convince, whether through reason, emotion, or other means. Whether you're describing someone who is strong-willed, stubborn, or simply hard to read, these synonyms for "unsuggestible" can help you capture the right tone and meaning in your writing.