only 1 use
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- 'All that he would have to do," continued the worried bug, "is travel through miles of harrowing and hazardous countryside, into unknown valleys and uncharted forests, past yawning chasms and trackless wastes, until he reached Digitopolis (if, of course, he ever reached there).p. 96.8
There are no more uses of "harrowing" in The Phantom Tollbooth.
Typical Usage (best examples)