The word skeptic is a noun, meaning a person who doubts that something is true; a person who doubts religious teachings. Example sentence:
I'm a political skeptic, I don't believe anything a politician says until it happens.
A skeptic is, essentially, someone that doubts something. An example sentence is: Barbara doesn't believe in psychics, she is a skeptic.
The scientist was a skeptic of how the world was created in biblical terms because he only believed in the theory of evolution.
Both "skeptic" and "sceptic" are correct spellings in English. "Skeptic" is more commonly used in American English, while "sceptic" is more common in British English.
believer
skeptic
On the subject of flying saucers, he was definitely a skeptic. Any skeptic knows that it is often impossible to prove that something is impossible, only that it is unlikely.
The people were skeptic about aliens and UFO's because they don't believe in them.
You can use the word Truss in a sentence like this.
Can you use the word concluding in a sentence? Done.
Doubt disbelief skeptical skeptic
Skeptical, skepticism, skeptically.
Just use it! Or do you mean, can you use the word beheld in a sentence.