Monolithically is an adverb that means something is done in a rigid or inflexible way, as if it were a single block or monolith. Some synonyms for monolithically are immovably, intransigently, inflexibly, uncompromisingly, rigidly, undeviatingly, and steadfastly. These words all imply that there is no room for change or compromise, and that the approach being taken is rigid and unyielding. Using different synonyms can add variety and nuance to your writing, making it more engaging and thoughtful. However, it is important to ensure that the synonym accurately captures the intended meaning and connotation of the original word.