The behavior or quality of being a crank; eccentric or obsessive behavior.
From crank (an eccentric person) + -ery (a suffix creating nouns meaning 'behavior' or 'practice,' as in trickery or bravery). Created to describe the actions typical of cranky people.
Crankery can actually be genius in disguise—many brilliant inventors and artists were called cranks in their time, and what looked like eccentric obsession turned out to be innovation.
Complete word intelligence in one call. Free tier — 50 lookups/day.