Lewis and Short define formidulosus as both "producing fear, dreadful, terrible, terrific" and "experiencing fear, afraid, timid, timorous."
The Oxford English Dictionary defines fearful as both "causing fear; inspiring terror, reverence, or awe; dreadful, terrible, awful" and "frightened, timorous, timid, apprehensive."
All are auto-antonyms, words that can mean the opposite of themselves.
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