Don Marcelo was climbing up a mountain covered with woods. The forest presented a tragic desolation. A silent tempest had installed itself therein, placing everything in violent unnatural positions.
He was filling his pails for the third time, and murderously contemplating the lieutenant's back when something occurred so absurd and unnatural that it reminded him of the fantastic flash of the cinematograph;
Again the Princess smiled her unnatural, yet characteristically natural, smile.
He died an unnatural death.
Her pale, thin face had an unnatural sallow, bilious tinge.
How he escaped the dungeons of Aridhol and fled alone to the Borderlands with Mordeths unnatural assassins at his heels.
It was Ivan Ivanitch, and his cry was not babbling and persuasive as usual, but a wild, shrill, unnatural scream like the squeak of a door opening.
It's very easy to sound natural in your own native language, and very easy to sound unnatural in your non-native language.
It was the sort of gibber, hoarse and rapid, and it filled them with an icy terror because it was so weird and so unnatural.
not in accordance with or determined by nature; contrary to nature: affected, paranormal, naturalness, violent, supernatural
speaking or behaving in an artificial way to make an impression: contrived, affected, stilted, forced, plummy, studied, strained, artificial, hokey, agonistic, mannered, affectedness, elocutionary, constrained
not normal; not typical or usual or regular or conforming to a norm: insane, subnormal, vicarious, antidromic, anomalous, irregular, defective, kinky, freakish, atypical, abnormal, normality, deviate, normalcy, perverted, supernormal, brachydactylous, brachydactylic, aberrant, deviant