monolithic

/M AA0 N AH0 L IH1 TH IH0 K/
adjective
  1. 1

    Of or resembling a monolith.

  2. 2

    Having a massive, unchanging structure that does not permit individual variation.

  3. 3

    (said of an operating system's kernel) consisting of a single program using a single memory-addressing space

Antonyms

Source: https://en.wiktionary.org/wiki/monolithic