Capillaceous is an uncommon and rarely-used word that refers to something resembling hair or having hair-like thinness. The word is often found in scientific contexts, specifically in the field of botany, describing plants with fine and hair-like structures. Synonyms for capillaceous include filamentous, hairy, filamentary, threadlike, tenuous, and delicate. These descriptors can be used more effectively in daily language, as they are far more commonly used and easily understood. With these synonyms, we can describe objects with thin and delicate structures and better capture their unique qualities.