watered-down

adjective
  1. 1

    Diluted; containing extra water

    โ€œNobody likes watered-down scotch.โ€

  2. 2

    (by extension) Weakened or simplified

    โ€œThey teach a watered-down calculus class for non-majors.โ€

Source: https://en.wiktionary.org/wiki/watered-down