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It is improbable you are smart enough to graduate from high school.
That's an improbable story.
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.
It was improbable that they would find the cache.
My admission to med school is quite improbable.
Your improbable story makes good copy- I'll print it!
His cause of death being foul play is improbable.
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.
It is highly improbable to spot an agelast at 'Comedy nights with Kapil Show' .
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.
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.
The suffix for "improbable" is "-able".