Noncompatibility, the state of being incompatible, refers to the inability of two or more things to exist or function together harmoniously. Some synonyms for the term include incongruity, inconsistency, disagreement, incompatibleness, and conflict. These words can be used interchangeably with noncompatibility to describe situations where two or more things cannot be integrated due to differences in nature, purpose, or design. Other synonyms include irreconcilability, unsuitability, discordance, and disparity. No matter the word choice, noncompatibility often refers to a limitation or obstacle that must be overcome in order to achieve a desired outcome.