Fittingnesses are a set of characteristics that describe something that is appropriate or suitable to a particular situation. There are many synonyms for this word, which can be used interchangeably depending on the context. Some examples of synonyms for fittingnesses include appropriateness, suitability, relevance, pertinence, and congruity. These words all describe the quality of something being well-suited or appropriate in a given situation. Other related words that can be used as synonyms for fittingnesses include propriety, correctness, fitness, and decorum. Ultimately, the choice of which synonym to use will depend on the specific context and the nuances of the situation at hand.