To a large extent; very; quite — an adverb used to emphasize degree or extent.
よほど疲れているらしく、彼は早く寝てしまった。
He must have been extremely tired; he went to bed early.
その事件はよほど社会に影響を与えた。
That incident had a considerable impact on society.
Almost; nearly; on the verge of — indicating something was just about to happen or nearly the case.
よほどのことがない限り、彼は来ないだろう。
Unless something extraordinary happens, he probably won't come.
よほど腹が立っていたのか、彼は机を叩きそうになった。
He must have been so angry that he almost hit the desk.