vastly
/ˈvæstli/ adverb C1- Greatly, in a vast manner.
From the library
He could see that she was vastly impressed by this vague talk, so he endorsed his pose by random insinuations concerning great wealth, and mentioned familiarly a few names that are handled reverently by the proletariat.
I am sure he will be vastly happy to oblige you, and will save all the best of the coveys for you.”
She was secretly vastly pleased at Anne’s impulsive caress, which was probably the reason why she said brusquely:
Having vastly delighted the assembly, he sat down amidst universal applause.
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