Many scientific concepts are of necessity vague, for instance species in Biology cannot be precisely defined, owing to unclear cases such as ring species.
The word 'vague' is an adjective. An example of a sentence using the word is: He's not sure on the exact spot, but he has a vague idea of the area.
"His intentions were very vague."
Her instructions were so vague that I had trouble understanding what she wanted me to do.
She avoided answering my questions and was intentionally vague.
I wish you would not be so vague about your plan: I really need specific details.
David made a vague gesture in the direction of the computer and returned to staring gloomily at his coffee.
It is an adjective. ex: The vague boy went to the store If it was a noun the sentence would not make sense. The vague went to the store.
"That desciption is too vague, you need to be more specific."my quiz was vague because of my hand writing
I am not writing a sentence using that word.
a sentence using the word endotracheal
This is a sentence using the word aviator.
this is a sentence using the word armchair.