The phrase "like putty hands" typically refers to hands that are extremely pliable or easily molded, and thus finding an antonym for this phrase can be a bit challenging. However, one possibility is to focus on words that convey the opposite of pliability or malleability. Thus, antonyms could include words like rigid, inflexible, unyielding, tough, and unmanipulable. Alternatively, antonyms could be sought that counteract the sense of "like putty," such as words like firm, strong, resolute, steady, or controlled. Ultimately, the best antonym for "like putty hands" will depend on the context in which the phrase is being used and the specific meanings that are being conveyed in that context.