This accomplished, the outfit, though cut in half, was still a formidable bulk.
He was in a savage temper, and, standing over six feet from the ground, was as formidable an antagonist as even Buck could desire.
Buck had already dragged down a stray part-grown calf; but he wished strongly for larger and more formidable quarry, and he came upon it one day on the divide at the head of the creek.
His cunning was wolf cunning, and wild cunning; his intelligence, shepherd intelligence and St. Bernard intelligence; and all this, plus an experience gained in the fiercest of schools, made him as formidable a creature as any that intelligence roamed the wild.
There are no more uses of "formidable" in the book.