Undiluted/ˌʌndaɪˈluːtɪd/ Definition 1 of 2Pro Tip 1/3Purity emphasized Use 'undiluted' when highlighting the pure form of something without any additions. The recipe calls for undiluted apple juice. Pro Tip 2/3Potential danger Using 'undiluted' can indicate a substance's strength and the care needed when used. Handle the undiluted acid with caution. Pro Tip 3/3Metaphoric use Metaphorically, 'undiluted' refers to ideas or expressions without softening or distortion. She delivered the undiluted facts about the issue.