My answer is
You use it normally example:
That word is useless in the phrase.
If u wanna now its fonctions just ask...
ps:its an adjective
aerospace is useless.
Jacob demoralized Stephanie when he told her that her current job is useless.
"The lodestone in the cave walls made their magnetic compasses useless."
Example sentence - Amanda is more useless than a used tissue.
This makeup is useless to me.
The brevity of the report and all its confusing abbreviations makes it useless for anything.
A white elephant means 'something useless and expensive to keep'
you should say i went to the mall and bought a useless pair of shoes
To brainstorm as a group, bandy or toss about any idea that strikes anyone, no matter how useless or silly.
He tramped across the mountains with just his dog for company. They tramped over the footprints, rendering them useless to the detectives.
I concluded that it was useless after spending an hour on the project.
My coworker and I went on a business trip.