The urgency with which some public health experts advocate soda taxes speaks to how obesity has become a formidable, and seemingly intractable, public health problem.
But the fighting over the past five months has shown that Isis has become a formidable military force.
If it extends that experiment, it could become a formidable competitor.
But what could have been a cakewalk for Woods has become a formidable challenge.
The researchers argue that Twitter has become a "formidable broadcasting tool" for world leaders.
India is one of the endemic areas where control of malaria has become a formidable task.
Mtb has become a formidable pathogen by utilizing whatever carbon it can acquire to maximize its potential for growth.
But senators and other elected officials who once seemed untouchable have become fair game for primary challenges in the last several years, and Mr. Lugar has a formidable problem on his hands with Mr. Mourdock.
Furthermore, when two concepts are to be learned together (e.g., JIG = TRIANGLE and GEK = GREEN), memory for each concept tends to be mixed, and it becomes a formidable task to solve either problem.
My mother never became sick from tasting raw fish, but, by chance, gefilte fish turned out to be a formidable problem for my medical partner's wife, Rita.
