Difference between Unbelievable and Undreamt

UNBELIEVABLE vs UNDREAMT: ADJECTIVE

Dumfounding, Marvellous, Tall, Unlikely, Undreamed, Unconvincing, Unimagined, Undreamt, Dumbfounding, Implausible, Improbable, Fabulous, Marvelous, Astounding, Incredible

Unheard, Illimitable, Wondrous, Infinite, Unthinkable, Boundless, Limitless, Unimaginable, Of, Undreamt of, Undreamed of, Unbelievable, Incredible, Unimagined, Undreamed

Dumfounding, Marvellous, Tall, Unlikely, Undreamed, Unconvincing, Unimagined, Undreamt, Dumbfounding, Implausible, Improbable, Fabulous, Marvelous, Astounding, Incredible

Unheard, Illimitable, Wondrous, Infinite, Unthinkable, Boundless, Limitless, Unimaginable, Of, Undreamt of, Undreamed of, Unbelievable, Incredible, Unimagined, Undreamed

The facts in this case are almost unbelievable.
Completely unbelievable premise, not in a good way.
It means that she got her unbelievable orgasm.
Unbelievable that any service cannot cope with GRs.
Unbelievable answer and zero empathy tonsolve the situation.
And we had an unbelievable amount of leftovers.
Today it all seems rather ridiculous and unbelievable.
Your satisfaction is our top priority and we want you to feel that you got an unbelievable deal at an unbelievable price.
And we would find like unbelievable points, unbelievable points.
Of all the unbelievable suppositions, this seems to be the most unbelievable.

Palatial hotels were built sumptuous restaurants were opened, both of which offered their customers luxuries undreamt of theretofore in such establishments.
It has opened avenues toward previously undreamt of information and communication opportunities.
Seems this song is full of undreamt paradoxes.