To humans, very. An adult African elephant weighs up to 5.5 tons with tusks that can be 2.5 metres (8.2 feet) long and weigh 60 kilograms (132 pounds) each. They can trample you with their feet and knock you out cold with their trunk. Male elephants also undergo a surge in hormones once a year, called musth, which makes them extremely aggressive.
In India alone, wild elephants kill about 200 people a year. A study from 1999 found that in just one region of India over a six-year period, 242 people were killed by wild elephants, compared to 90 by wolves, 50 by sloth bears, four by leopards and two by tigers.