Her luggage was so big and bulky it wasn't functional.
The engine functioned very well under extreme temperatures.
One problem is to work out how to make best use of the purely declarative nature of functional languages.
It is not one of the more accepted forms of the word and is only in a few dictionaries. The better word is non-functional if something isn't working at all or is dysfunctional if it is impaired. Example sentence: It is preferred to use the word non-functional instead of unfunctional.
use it by saying- how can you use the word ebullient in a sentence?
Can you use the word concluding in a sentence? Done.
How can you use the word infectious in a sentence
You can use the word Truss in a sentence like this.
The robot was fully functional.
Just use it! Or do you mean, can you use the word beheld in a sentence.
"My alarm clock has not been functional since my little brother stole its batteries." "Dr Brinden has completed his work and the robot is now fully functional."
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 ".