formidable

1 - Of all the weapons used by ground forces in modem warfare, tanks are probably the most formidable.

2 - Diabetes is a formidable illness that can result in serious complications, including heart attack, blindness, kidney failure, and loss of circulation to the lower extremities (feet and legs).

3 - The United States has unquestionably been the most formidable military power in recent years.

4 - In developing countries, the rapid increase in the numbers of older people needing healthcare, combined with the high levels of absolute poverty make supporting growing numbers of older people in need of long-term care a formidable challenge

5 - Cancer is unambiguously one of the most formidable diseases taking variable forms, which requires commitment of research activities from various disciplines.