some random quotes:
"The true measure of a man is how he treats someone who can do him absolutely no good."
- Samuel Johnson (1709-1784)

"Come, you are a tedious fool." - Shakepeare, Measure for Measure

"You that are old consider not the capacities of us that are young; you do measure the
heat of our livers with the bitterness of your galls: and we that are in the vaward of our
youth, I must confess, are wags too." - Shakespeare, Henry IV, part ii
(vaward = foremost part)

but you are looking for uncommon words; here are a couple (but of a negative nature):
degringolade - a rapid decline or deterioration; downfall

ultracrepidarian
[adj] going beyond one's proper province; giving opinions on matters beyond one's
knowledge
[n] one who ventures beyond his scope; an ignorant or presumptuous critic

maybe this will prime the pump..