formidable
/ˈfɔɹmɪdəbəl/ adjective B2- Causing fear, dread, awe, or discouragement as a result of size, strength, or some other impressive feature; commanding respect; causing wonder or astonishment.
- Difficult to defeat or overcome. · a formidable opponent
From the library
When his body had been carried from the cellar we found ourselves still confronted with a problem which was almost as formidable as that with which we had started.
This also was opened, and led down a flight of winding stone steps, which terminated at another formidable gate.
The famous game-shot, sportsman, and man-about-town was a big, swarthy fellow, with a formidable dark moustache, shading a cruel, thin-lipped mouth, and surmounted by a long, curved nose, like the beak of an eagle.
To undermine the ground for fifty feet—to devote three years to a labor which, if successful, would conduct you to a precipice overhanging the sea—to plunge into the waves from the height of fifty, sixty, perhaps a hundred feet, at the risk of being dashed to pieces against the rocks, should you have been fortunate enough to have escaped the fire of the sentinels; and even, supposing all these perils past, then to have to swim for your life a distance of at least three miles ere you could reach the shore—were difficulties so startling and formidable that Dantès had never even dreamed of such a scheme, resigning himself rather to death.
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