> ‘improbably felled’
OK, since you seem to be too dense to get it.
“allegedly felled”
“felled according to the account”
“the author records that he was felled ...”
Please.
If you don’t have any imagination and skill, don’t accuse me of “twisting myself into pretzels”.
No go away and play with people your own mental age.
None of the sorry attempts you used convey the idea that the author was trying to convey, which is that the felling of a giant by a boy with a sling and a stone is something extraordinary.
That is why the story made it into the Bible in the first place. It is used to illustrate, that with Gods help, extraordinary things can happen to ordinary people.
You may wish to deny the extraordinary power of God by trying to change the meaning, but that’s what still taught in Sunday Schools all over the world. And the story of David and Goliath is used to illustrate the same.