IPA: /prəʊˈzeɪɪzəm/
KK: /proʊˈzeɪɪzəm/
A type of expression or style that is straightforward and lacks poetic beauty, often seen as dull or ordinary.
The prosaism in his writing made it difficult to engage the readers.
Prosaism is formed from "prosa" (from Latin *prosa*, meaning straightforward or direct) and "-ism" (a suffix used to denote a practice or philosophy). The word refers to a style of writing that is straightforward and lacks the embellishments of poetry.
Think of 'prosa' meaning straightforward — that's why prosaism refers to a direct and simple style of writing.