The verb that means to laugh foolishly or nervously is "titter."
The suffix for undo is to not do.
The suffix of "moon" is "-oon".
The suffix is -er, meaning "one who campaigns."
The suffix for "instruct" is "-ion".
Foolishly is an adverb, yes.Some example sentences are:Foolishly, I rejected the offer.He foolishly sold the antique for less than its value.
I foolishly believed my brother when he told me it was a school day when it was really Saturday.
A Treasury of Foolishly Forgotten Americans has 272 pages.
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A Treasury of Foolishly Forgotten Americans was created on 2008-03-25.
The adverb is foolishly and it modifies the verb believed.
Wisely
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