So the fact that "unfrightened" exists as a word doesn't rule out the possibility that "frighten" has a past participle.    From Wordnik.com.  [Archive 2010-07-01] Reference

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.    From Wordnik.com.  [Archive 2010-07-01] Reference

An unfrightened prisoner makes an unlikely informer.    From Wordnik.com.  [The Dark Art of Interrogation] Reference

What was remarkable to me was how unfrightened they looked.    From Wordnik.com.  [CNN Transcript Mar 14, 2004] Reference

My hand was on the huge, curved ivory surface of one tusk as she turned her mild, unfrightened eye to regard me.    From Wordnik.com.  [The Skrayling Tree]

But if you look at what Dean actually says, then -- for the most part -- the horses remain distinctly unfrightened.    From Wordnik.com.  [THE VIRTUES OF ENGAGEMENT] Reference

I remembered a pale, ragged little girl who, though just four years old, had seemed ageless, silent and patient, confidently unfrightened by her captivity.    From Wordnik.com.  [Water Sleeps]

The butterfly spread its wings and floated off her finger and went fluttering, unconcerned, unfrightened, up across the wild grass and the goldenrod of the field.    From Wordnik.com.  [Way Station]

Meanwhile M., who was paternostering with worm and minnow, came down to inform S. that he had already landed four perch, and that the shoal was still unfrightened.    From Wordnik.com.  [Lines in Pleasant Places Being the Aftermath of an Old Angler] Reference

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.    From Wordnik.com.  [A better way to die? | The Blog of Michael R. Eades, M.D.] Reference

She was still unfrightened, unsuspicious of the untoward.    From Wordnik.com.  [Told in the East] Reference

She stared back at Cunningham through wide, unfrightened eyes.    From Wordnik.com.  [Rung Ho]

Her face was white; her eyes blazed, but she seemed calm and unfrightened.    From Wordnik.com.  [The Fire People] Reference

As it was, they were unfrightened, and he knew where to find them in the morning.    From Wordnik.com.  [The Keeper] Reference

His delight when he found the child unfrightened looking out of the port was unbounded.    From Wordnik.com.  [The Man] Reference

Notice, too, the unfrightened calm of the bird itself, passive under the hand of its loving Creator.    From Wordnik.com.  [The Old Masters and Their Pictures For the Use of Schools and Learners in Art] Reference

There came by a riderless horse, gentle enough, unfrightened, wanting only to drink at the little stream.    From Wordnik.com.  [The Long Roll] Reference

Having crept sufficiently near, he singled one out and fired, but without effect; the deer remained unfrightened.    From Wordnik.com.  [A Tour on the Prairies.] Reference

There it clung, chirping flatly, moving its head from side to side and watching the two with bright, unfrightened eyes.    From Wordnik.com.  [The Devolutionist and the Emancipatrix] Reference

Bulls and other ferocious beasts think it waste of time to charge the fearless; they get no fun out of an unfrightened victim.    From Wordnik.com.  [Dangerous Ages] Reference

Yellow-bellied ore-flats and Ungava petrol-tanks punted down leisurely out of the north, like strings of unfrightened wild duck.    From Wordnik.com.  [Actions and Reactions] Reference

That reason was furnished me by the complacent and unfrightened prophets four years ago, and it has been furnished me again to-day.    From Wordnik.com.  [Christian Science] Reference

"It's" -- she tried to swallow the quaver in her voice and make it cool and unfrightened -- "Irene Lois Humbolt -- Mrs. Dale Humbolt.".    From Wordnik.com.  [Space Prison] Reference

Perception of Reality: These individuals tend to have a "superior relationship with reality" and are "generally unthreatened and unfrightened by the unknown.".    From Wordnik.com.  [Writing on Air] Reference

He became lost in a great wonder as to what under heaven this little Four-eyes meant by standing there and staring at him with that white and entirely unfrightened face.    From Wordnik.com.  [Queed] Reference

There was nothing mocking in the soft, graceful stir of the expanded foliage, in the twittering of the unfrightened birds, or the scampering of the squirrels, over the rustling carpet of dead leaves.    From Wordnik.com.  [Beauty and the Beast, and Tales of Home] Reference

Sometimes the prairie was crowded with herds of black buffalo running in fear; or, again, the herds, unfrightened, fed scattered out; so that the hills far and near were dotted with their dark forms.    From Wordnik.com.  [Blackfeet Indian Stories] Reference

I mean the person who loves the clean, steady, unfrightened eyes of man looking through a telescope and the white stare of an imbecile -- equally, I mean quite a large, generous, magnanimous company.    From Wordnik.com.  [The Fountainhead]

It was good to see, if only for a few weeks, a prominent Australian politician so unfrightened of his past as to allow the above comment to be published at his blog, and read by tens of thousands of people.    From Wordnik.com.  [The Orstrahyun] Reference

A little more dark silence -- the shaking of the bed under the hilarity of those astonished, bethrilled, but thoroughly unfrightened young women in the dark corner on my left ceased, and again the door opened.    From Wordnik.com.  [A Knight of the Cumberland] Reference

The young man’s eyes were unfrightened, undisturbed.    From Wordnik.com.  [The Berrybender Narratives] Reference

He wears metal to flaunt his power, to show how unfrightened — how unthreatened — he is by anything we could do to him. ".    From Wordnik.com.  [Mistborn] Reference

Funny how unfrightened he was.    From Wordnik.com.  [Three Hearts and Three Lions]

The deer, unfrightened, stoops to drink.    From Wordnik.com.  [Choice Specimens of American Literature, and Literary Reader Being Selections from the Chief American Writers] Reference

Of life; a friend's unfrightened dying face.    From Wordnik.com.  [The New World] Reference

His outlook on life was calm and unfrightened.    From Wordnik.com.  [The Strength of Gideon and Other Stories] Reference