Criticalness refers to the state of being highly important or indispensable. Antonyms for this word include insignificance, irrelevance, and unimportance. These words denote the lack of importance and value that a particular thing or aspect possesses. Indifference, unconcern, and apathy are other antonyms that describe a state of being disinterested or lacking in criticalness. A less common antonym for criticalness is triviality, which refers to something that is insignificant or unimportant. The opposite of criticalness is often used to describe something that is not crucial or essential, but rather merely incidental or peripheral to a particular situation or context.