Monolithic

1. Of or resembling a monolith; thus:
   1. Consisting of a single chunk of hard material rather than an assembly of discrete parts.
   2. (figuratively) Having a massive, unchanging structure that does not permit individual variation.
   3. (computing, figuratively, said of an operating system's kernel) consisting of a single program using a single memory-addressing space.

Antonyms

• (computing): modular