Idle means: at rest or sleeping or not moving.
The car was staying idle.
He spent the day in idle conversation, avoiding work and responsibilities.
I let my car idle for 10 minutes.
many aircraft sat idle during the strike---------------idleness is a noun... and in your sentence is a verb(i didn't mean that your sentence was wrong... okay? ^^")so here you go... a sentence with a word idleness.Because of his idleness, he lost a lot of time to study.
use it by saying- how can you use the word ebullient in a sentence?
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.
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 ".