Sound-thinking refers to the ability to think logically, rationally and critically. It is a quality that is highly valued in any professional or personal setting. For people who possess this quality, they are often sought after as leaders and decision-makers. There are several synonyms for the word "sound-thinking". These include: 1. Rational thinking: This refers to the use of reason and logic to arrive at a conclusion. 2. Critical thinking: This involves analyzing information and evaluating it to make an informed decision. 3. Logical thinking: This encompasses the use of reasoning to arrive at a conclusion that is based on facts and evidence. 4. Analytical thinking: This involves breaking down complex information into smaller parts to better understand it. 5. Pragmatic thinking: This refers to the ability to make practical and realistic decisions based on the current situation. In summary, using these synonyms instead of the word "sound-thinking" can help convey the message more effectively.