subtler

/S AH1 T AH0 L ER0/
adjective
  1. 1

    Hard to grasp; not obvious or easily understood; barely noticeable.

    โ€œThe difference is subtle, but you can hear it if you listen carefully.โ€

    ant:simple
  2. 2

    (of a thing) Cleverly contrived.

  3. 3

    (of a person or animal) Cunning, skillful.

  4. 4

    Insidious.

  5. 5

    Tenuous; rarefied; of low density or thin consistency.

  6. 6

    Refined; exquisite.

Source: https://en.wiktionary.org/wiki/subtle, https://en.wiktionary.org/wiki/subtler