Natural is the opposite of unnatural.
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.
The root word for unnatural is "natural".
The way to spell the word is unnatural.
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.
His friends thought that Harry showed an unnatural interest in death.
How do you use the word decibel in a sentence?What is decibel used for?
Since that is not a word I would not attempt to use it in a sentence.
You just did use the word colonize in a sentence.
You can use the word Terrorist in a sentence as " Muslims are not terrorist ".
use the word puzzlement in a sentence