Infirm's synonym is weak so just use the common word weak in a sentence and replace it with infirm.
For instance...
My grandmother became weak with age.
My grandmother became infirm with age.
Voila! By doing that you just made a sentence for INFIRM.
She has a retentive memory, able to remember even the smallest details of past events.
use it by saying- how can you use the word ebullient in a sentence?
Studying gerontology has helped me understand the aging process and how to provide better care for older adults.
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.
sick tick, infirm worm
You can use an underscore to remove a word out of a sentence. It can be placed where the word was.
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 ".