That's an improbable story.
A response to this question is improbable. Your recommendation of my answer is also, equally improbable. It is improbable that you will find my answer helpful. There. Three examples.
improbable
use aver in a sentence
Impossible means that it cannot, in any way, ever, happen. Improbable means that it could happen but is extremely unlikely. Please note though that in everyday speech some things are referred to as impossible when in fact they are merely improbable.
use the word rigorousness in a sentence
It was improbable that they would find the cache.
My admission to med school is quite improbable.
I might win the lottery, but it is improbable.
A response to this question is improbable. Your recommendation of my answer is also, equally improbable. It is improbable that you will find my answer helpful. There. Three examples.
Are you asking for a sentence using the word? Try, It is improbable you are smart enough to graduate from high school.
His cause of death being foul play is improbable.
Your improbable story makes good copy- I'll print it!
It is highly improbable to spot an agelast at 'Comedy nights with Kapil Show' .
That I would vote for him, given his platform, is highly improbable, since I disagree with him. It is improbable that a baby is born knowing how to walk or talk.
Implausible is an adjective which means improbable, unlikely, unbelievable, or incredible. Example sentence: The plot of that movie was implausible, I'm not recommending it.
Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.Looking at the height of the wall, it was improbable that he would be able to climb over it.
The word "improperble" does not exist in standard English vocabulary or dictionaries. It seems to be a made-up or non-standard word. Therefore, it cannot be used in a sentence according to standard English grammar.