undermined

/AH0 N D ER0 M AY1 N D/
verb
  1. 1

    To dig underneath (something), to make a passage for destructive or military purposes; to sap.

  2. 2

    To weaken or work against; to hinder, sabotage.

    โ€œThe war efforts were undermined by the constant bickering between the allies.โ€

  3. 3

    To erode the base or foundation of something, e.g. by the action of water.

Antonyms

Source: https://en.wiktionary.org/wiki/undermine, https://en.wiktionary.org/wiki/undermined