Strong-looking is a term that can express an imposing, sturdy, or resilient appearance. If you need to describe someone or something as strong-looking, you might want to consider using some synonyms to avoid repetitive language. Some synonyms for strong-looking are robust, muscular, hearty, forceful, powerful, strapping, rugged, hale, healthy, and sturdy. Each of these words can convey a sense of sturdiness, resilience, and toughness that is similar to being strong-looking. Using these synonyms can help add more depth and variety to your writing, making it more engaging and interesting for the reader.