You use immeasurably to emphasize the degree or extent of a process or quality.
例句
They have improved immeasurably since their arrival...他们自来到这里以后,有了很大改进。The situation today is immeasurably more acute than it was 25 years ago.今天的形势远比 25 年前严峻。
英英词典释义
Adverb
1. to an immeasurable degree; beyond measurement;
"the war left him immeasurably fearful of what man can do to man"