"Are fixed" is a phrase that suggests something is unchangeable, unalterable or immovable. Synonyms for this phrase include "are set," "are established," "are definite," "are permanent," and "are firm." When something is fixed, it implies that it cannot be changed or modified. Other synonyms for "are fixed" include "are certain," "are predetermined," "are agreed upon," and "are non-negotiable." These alternatives further emphasize the notion that something is established and unlikely to be modified without significant effort or persuasion. Regardless of which synonym one uses, the idea conveyed is that of stability and rigidity.