Wiktionary
all the more
adv. even more; notably, but even more notably due to additional information, either preceding or following the statement.
Usage examples of "all the more".
I had often marALL THINGS WISE AND WONDERFUL57 velled at it, but it made the present disaster all the more unbearable.
A tender look swept his face, an expression all the more astonishing because it seemed to be directed elsewhere.