Auspiciousness refers to the state of being promising or indicative of future success or good fortune. Some synonyms that can be used instead of auspiciousnesses include propitiousness, felicity, good omen, favorable circumstance, good portent, and fortunate event. These synonyms convey a similar positive connotation and denote a sense of optimism and potential for success. While there may be slight nuances in the meaning of these words, they can generally be used interchangeably with auspiciousness when referring to positive circumstances or events. Using synonyms can provide a greater variety of descriptive language and better convey the writer's intended meaning.