Adj. unintelligible, unaccountable, undecipherable, undiscoverable, unknowable, unfathomable; incognizable[obs3], inexplicable, inscrutable; inapprehensible[obs3], incomprehensible; insolvable[obs3], insoluble; impenetrable. illegible, as Greek to one, unexplained, paradoxical; enigmatic, enigmatical, puzzling (secret) 533; indecipherable. obscure, dark, muddy, clear as mud, seen through a mist, dim, nebulous, shrouded in mystery; opaque, dense; undiscernible &c. (invisible) 447[obs3]; misty &c. (opaque) 426; hidden &c 528; latent &c 526. indefinite, garbled &c (indistinct) 447; perplexed &c. (confused) 59; undetermined, vague, loose, ambiguous; mysterious; mystic, mystical; acroamatic[obs3], acroamatical[obs3]; metempirical; transcendental; occult, recondite, abstruse, crabbed.
— from Roget's Thesaurus by Peter Mark Roget

Adelia, with a tray of used plates, encountered the son of the house as he passed through the kitchen on his return, and her eyes were those of one who looks upon miracles.
— from Seventeen A Tale of Youth and Summer Time and the Baxter Family, Especially William by Booth Tarkington

The Trojans offered up prayers even to those gods who fought for the Greeks.
— from The Works of Voltaire, Vol. IV of XLIII. Romances, Vol. III of III, and A Treatise on Toleration. by Voltaire

We, at least those of us personally engaged in this controversy, maintain no such doctrine as the pardon of sin on condition of repentance—as if repentance were something offered and remission an equivalent received instead.
— from Unitarianism Defended A Series of Lectures by Three Protestant Dissenting Ministers of Liverpool by John Hamilton Thom

There were many two-horse landaus waiting our pleasure outside the station, and the horses were all so robust and handsome that we were not put to our usual painful endeavor in seeking the best and getting the worst.
— from Roman Holidays, and Others by William Dean Howells

The only unenthusiastic person, except Rollitt, was Dangle.
— from The Cock-House at Fellsgarth by Talbot Baines Reed

"Sanguine in his temperament, of uncontrolled passions, excited to a degree of insanity by the newborn ideas which raged in France, possessed of the wildest dreams of national glory and aggrandizement—in a word, the very incarnation of Jacobinism, he was the fittest brand which the assembly could have selected to hurl into the magazine of political strife.
— from Great Events in the History of North and South America by Charles A. (Charles Augustus) Goodrich

After having fed these creatures, they offer up prayers, each to his own deity, but mostly to the god Siva, for long life and for protection from its deadly bite, making offerings
— from Life and Travel in India Being Recollections of a Journey Before the Days of Railroads by Anna Harriette Leonowens

These are separated by terraces or upland plains, each range forming the boundary of the lower and the abutment of the higher terrace.
— from The Desert World by Arthur Mangin

Entire upper parts umber-brown, unspotted on the top of the head, but on the other upper parts edged and tipped with ashy-white and reddish fulvous.
— from Extinct Birds An attempt to unite in one volume a short account of those Birds which have become extinct in historical times by Rothschild, Lionel Walter Rothschild, Baron