If the bowling ball is the implacable enemy of the egg, guerrilla marketing is the implacable enemy of all the assumptions that pass for business as usual.

FORBES: Building Gorilla Companies with Guerrilla Marketing

On the other hand, Ministers Yuli Edelstein and Yisrael Katz pointed out that at its leadership conclave in Bethlehem, Fatah exposed itself as an implacable enemy of Israel.

CENTERFORSECURITYPOLICY: Israel and the 'realists'

Almost a century later, America's continuing domination of cotton production led the Soviet Union, its implacable enemy in the cold war, to look for self-sufficiency in this vital crop.

ECONOMIST: Cotton