The math problem left him dumbfounded.
I was dumbfound when Jimmy cheated yesterday
The word dumbfound can be interchanged with such words as surprised or shocked. For example, Billy was surprised when his parents bought him a car for his birthday. Billy was shocked when his parents bought him a car for his birthday. Billy was dumbfounded when his parents bought him a car for his birthday.
I would never use the word. I would change it to "dumbfounded", as in "She was dumbfounded by the boys' strange behavior." Dumbfounded just means astonished or amazed. Being dumb means not being able to speak, the dumb can't talk, therefore being dumbfounded is just being struck speechless by something.
dumbfounded
Yes.
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.
How do you use the word decibel in a sentence?What is decibel used for?
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 ".