ascertain-assiduous-derivative-existential-plethora-prudent-Sisyphean-subsequent-trepidation-worrisome
At first he knew that it was an existential problem—that sadly, a worrisome decision he must make. While he was normally assiduous in his thinking, and always prudent in his considerations, he felt great trepidation that friends would assume his idea was derivative, and, just like his brothers attempt, it would subsequently fail. Without a plethora of other ideas, he ascertained that this project was Sisyphean; there was just no way to live right under a waterfall.
Neat, unexpected ending.