You searched for: “most atonic
atonic (adjective), more atonic, most atonic
1. Relating to, caused by, characterized by, or exhibiting lack of muscle tone: Someone who has an atonic body, or a part of the body, has a weakness or reduction in the normal strength or firmness of a tissue or some other part of the body.
2. A description of a syllable or a sound that is not accented or stressed: The syllables of the words Jim was saying did not include any atonic vowels.