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Use "unfrightened" in a sentence
"Thus, it was relevant that you can say "unfrightened" and "unconfused", suggesting that these are adjectives, but you can't say "unfeared" or "unliked", suggesting that these are participles, not adjectives."
"So the fact that "unfrightened" exists as a word doesn't rule out the possibility that "frighten" has a past participle."
"And it was before people learned that meat from unfrightened animals is better and worth more than that from frightened ones, which now provides packing house operators with a financial incentive to keep the animals calm."