Words that should be added/modified

Word	Occurence	Explanation
pet	no.1282	add example
unwonted	The Catechism Explained	funnily enough extremely similar to German
covenant	The Catechism Explained	known, but only vaguely, lacking precision in knowledge

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
quiescence vs. abeyance
phlegmatic has a negative connotation, doesn't it?
mendacity vs.
presage vs. omen