Strong complement refers to someone who compliments another person in a manner that is both sincere and impactful. There are several synonyms that can be used to describe this type of individual, including confident, capable, empowering, supportive, and encouraging. Someone who is confident provides reassurance and a sense of stability, while a capable person is skilled and reliable. Empowering individuals are those who provide others with the necessary tools and resources to succeed, while supportive people offer encouragement and guidance. Lastly, those who are encouraging provide positive feedback and show enthusiasm for others' accomplishments. All of these synonyms describe someone who is a strong complement, capable of bringing out the best in others.