There are numerous synonyms for the words "failing to keep", which is a phrase that refers to not being able to fulfill an obligation or commitment. Some of the most commonly used synonyms for this phrase are "not meeting", "not adhering to", "not upholding", "not following", "not honoring", and "not sticking to". Each of these phrases can be used interchangeably with "failing to keep" to indicate a similar meaning. Whether you're talking about a promise, a contract, or a standard, these synonyms offer a more varied and nuanced approach to expressing the idea of not being able to comply with a particular expectation.