Amateurishnesses is a tongue-twister of a word that describes the quality of something being done in a manner that is unprofessional or unskilled. There are several synonyms that can be used in place of this unwieldy word, such as ineptitude, bungling, clumsiness, inexpertness, and inexpertitude. These words all convey a sense of incompetence or lack of proficiency, but they do so in a much more concise and straightforward way. Using one of these synonyms instead of amateurishnesses can help to make your writing clearer and more effective, particularly if you are discussing a topic related to skill or expertise.