scathing

/S K EY1 DH IH0 NG/
verb
  1. 1

    To injure or harm.

  2. 2

    To blast; scorch; wither.

adjective
  1. 1

    Harshly or bitterly critical; vitriolic

  2. 2

    Harmful or painful; acerbic

Source: https://en.wiktionary.org/wiki/scathe, https://en.wiktionary.org/wiki/scathing