Mainstayed refers to a state of being supported or reinforced, usually in a figurative or symbolic sense. Some synonyms for the word mainstayed include "bolstered," "upheld," "strengthened," "sustained," and "secured." These words all carry a similar connotation of providing support or aid to something that might otherwise falter or fail. Other related synonyms might include "protected," "anchored," "fortified," or "maintained." All of these words convey a sense of stability, reliability, or dependability, which are all qualities that any individual or organization might find desirable in a wide variety of contexts.