All 4 Uses

formidable
in
The Legend of Sleepy Hollow
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The schoolhouse stood in a rather lonely but pleasant situation, just at the foot of a woody hill, with a brook running close by, and a formidable birch-tree growing at one end of it.†

formidable = intimidating or impressive
Among these, the most formidable was a burly, roaring, roystering blade, of the name of Abraham, or, according to the Dutch abbreviation, Brom Van Brunt, the hero of the country round, which rang with his feats of strength and hardihood.†
Such was the formidable rival with whom Ichabod Crane had to contend,
*
They harried his hitherto peaceful domains; smoked out his singing school by stopping up the chimney; broke into the schoolhouse at night, in spite of its formidable fastenings of withe and window stakes, and turned everything topsy-turvy, so that the poor schoolmaster began to think all the witches in the country held their meetings there.†

Definitions:

(1) (formidable)
intimidating or impressive -- arousing fear or admiration due to impressiveness or challenge
(2) (meaning too rare to warrant focus)