From Longman Dictionary of Contemporary Englishto the untrained eye/earto the untrained eye/earwhen someone who does not have special knowledge of a subject looks at something or listens to it To the untrained eye, the two flowers look remarkably similar. → untrained
Examples from the Corpus
to the untrained eye/ear• But he knew what he was looking at, though to the untrained eye it was just a pile of minuscule fragments. 