The word "fallaciousnesses" is quite a mouthful, and fortunately, there are several synonyms for this term that are easier to pronounce and remember. Some of the synonyms include erroneousness, falsity, deceitfulness, and misrepresentation. These terms are all related to the concept of something being misleading or untrue. Other synonyms for "fallaciousnesses" include dishonesty, deception, and duplicity, which all refer to actions or statements that are meant to fool or mislead others. Whatever word you choose to use, it is important to remember that being truthful and honest is always the best policy.