Antonyms for the word "ultra-precise" can be expressed in terms of less accurate, more general, or simply imprecise. They include words like vague, approximate, uncertain, ambiguous, rough, and inaccurate. These antonyms signify that the level of accuracy, specificity, or certainty is lower than that implied by the term "ultra-precise." Such words are often used to describe measurements, specifications, or actions that are not exact but have some degree of approximation. Antonyms of "ultra-precise" are useful in any context where a precise description is not required, or where a range of values is more appropriate than a specific value.