Non-performance is a situation where a task or obligation is not fulfilled. This word can be used to describe a variety of situations, including failure to meet deadlines, lack of productivity, or breach of contract. Some synonyms for non-performance include non-fulfillment, failure to deliver, non-compliance, and neglect. These synonyms emphasize the lack of action or effort put forth towards completing a task. Non-achievement and underperformance are also synonyms of non-performance that highlight the low level of success or accomplishment in a particular area. Whatever the synonym used, non-performance is an important concept in business, as it can have legal, financial, and reputational consequences.