heftiest

/HH EH1 F T IY0 AH0 S T/
adjective
  1. 1

    Heavy, strong, vigorous, mighty, impressive.

    โ€œHe can throw a hefty punch.โ€

  2. 2

    Strong; bulky.

    โ€œThey use some hefty bolts to hold up road signs.โ€

  3. 3

    (of a person) Possessing physical strength and weight; rugged and powerful; powerfully or heavily built.

    โ€œHe was a tall, hefty man.โ€

  4. 4

    Heavy, weighing a lot.

    โ€œShe carries a hefty backpack full of books.โ€

  5. 5

    (of a number or amount) Large.

    โ€œThat's going to cost you a hefty sum.โ€

Source: https://en.wiktionary.org/wiki/heftiest, https://en.wiktionary.org/wiki/hefty