When it comes to synonyms for the phrase "most detecting," there are quite a few alternatives that can be used depending on the context. Some possible synonyms include "most discerning," "most perceptive," "most observant," "most insightful," and "most intuitive." The phrase "most detecting" typically refers to the ability to identify something that is difficult to notice or uncover, and these synonyms convey a similar meaning. Other possible synonyms might include "most astute," "most investigative," or "most incisive." Ultimately, the most appropriate synonym depends on the specific context and intended meaning of the phrase.