"Fierce criticism" refers to strong and intense disapproval or negative evaluation of something or someone. It means that the criticism is harsh, intense, and often expressed with strong emotion or passion. Full definition
But the changes have been met with fierce criticism from researchers. (science.sciencemag.org)
The company's exit from the program comes as the heavily funded initiative is facing fierce criticism from skeptics questioning it's effectiveness. (timesunion.com)
The maximum credit of $ 2,000 per couple was added after fierce criticism from pundits that income splitting would benefit higher - income families more so than lower - income families. (moneysense.ca)