Malarky is a fun word to use when you want to indicate that something is nonsense or deceitful. However, it's always good to have a range of expressions at one's disposal, especially in cases where you want to avoid being repetitive. Among the synonyms for "malarky" you might consider using words such as "balderdash," "hogwash," "drivel," or "poppycock." Each of these words is colorful and expressive and could be employed in different contexts. Some other synonyms could include "rubbish," "blather," "codswallop," "bunk," or "tommyrot." All of these terms are fun to use and will add an entertaining twist to your speech or writing.