When describing something as very heavy, there are a number of synonyms that can be used to convey the same degree of weight and heft. Some possible options might include words like ponderous, cumbersome, massive, bulky, unwieldy, bulky, or substantial. Each of these words can be used to describe objects like furniture, machinery, or even people who are exceptionally large or muscular. By using different synonyms for the term very heavy, you can add nuance and variety to your writing, making it more engaging and expressive for your audience.