shallowest

adjective
  1. 1

    Having little depth; significantly less deep than wide.

    โ€œSaute the onions in a shallow pan.โ€

  2. 2

    Extending not far downward.

    โ€œThe water is shallow here.โ€

  3. 3

    Concerned mainly with superficial matters.

    โ€œIt was a glamorous but shallow lifestyle.โ€

  4. 4

    Lacking interest or substance.

    โ€œThe acting is good, but the characters are shallow.โ€

  5. 5

    Not intellectually deep; not penetrating deeply; simple; not wise or knowing.

    โ€œshallow learningโ€

  6. 6

    Not deep in tone.

  7. 7

    Not far forward, close to the net.

Antonyms

Source: https://en.wiktionary.org/wiki/shallow, https://en.wiktionary.org/wiki/shallowest