The term 'firmly embedded' can be described by two crossword solutions: 'ROOTED' and 'deeprooted'. The term 'ROOTED' means to be firmly established or fixed in a particular place, while the term 'deeprooted' implies that something is even more firmly established or fixed. Both terms suggest that something is strongly and securely placed in a certain location. This could refer to a physical object, an idea, or a belief.