D = just not quite good enough

What is it with adjectives and emotions beginning with d? Disappointment dejection depression despair disillusionment displacement dysfunctional downtrodden desperate. In school we are taught to work /hope for anything above a C grade. So is it any wonder negative adjectives and emotions begin with d? Perhaps the lesson is, if you want any more than a D-grade love life, you have to put in the work. But unfortunately, unlike A-levels, there are no study aids or revision guides