Words that should be added/modified

Word	Occurence	Explanation
mundane	no.521	end of underline delimiter missing
listless	no.765	better example, can't remember it for the life of me

Questions to answer:

Difference between abate & attenuate
→ abate can weaken to the point of disappearing, attenuate has to be always present.
Difference between castigate & chastize
Are fervid & fervent the same word?
Connotation of facetious
diatribe vs harangue
→ harangue more official and bombastic?
Difference between obstinate & obdurate