roughshod

Meanings

• (of a horse) having horseshoes with projecting nails to prevent slipping
• (of persons or their actions) able or disposed to inflict pain or suffering
  • "Stalin's roughshod treatment of the kulaks"
• unjustly domineering
  • "a manager who rode roughshod over all opposition"

Synonyms

barbarous, brutal, cruel, fell, heavy-handed, savage, vicious