The dark, ominous clouds gave an unnatural appearance to the valley below.
The sound of his voice through the microphone was unnatural.
The great strength of the Incredible Hulk is unnatural.
Paul isn't unnatural other than the offensive odor he spews from his pores.
It's obvious that you don't know how to use the word obvious in a sentence because you asked a question on how to use it.
artificial...fake...unnatural...
In this sentence I am typing write now, I used barefacedin a sentence.
You are unnerving me. That is one way you can use unnerving in a sentence.
Artificial or man-made
Natural is the opposite of unnatural.
The way to spell the word is unnatural.
She has a retentive memory, able to remember even the smallest details of past events.
use it by saying- how can you use the word ebullient in a sentence?
His friends thought that Harry showed an unnatural interest in death.
Studying gerontology has helped me understand the aging process and how to provide better care for older adults.
How can you use the word infectious in a sentence
Can you use the word concluding in a sentence? Done.
You can use the word Truss in a sentence like this.
Just use it! Or do you mean, can you use the word beheld in a sentence.
A caret symbol (^) is commonly used to indicate that a word or phrase should be removed from a sentence.
Since that is not a word I would not attempt to use it in a sentence.