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"Rapid Synthesis"
I noticed that "Bold" Synthesis was renamed to "Careful" in the 1.18 update, which lead me to think about how Rapid could be better labeled as well. Rapid Synthesis doesn't sound quite as descriptive of type of action you're making (progress at the cost of durability and quality) as it could be -- Would "Risky Synthesis" fit the bill? How about "Reckless"?
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I'd say Rapid Synthesis (or maybe Hasty Synthesis) fits it's description fine. The words "risky" and "reckless" don't have any implication of speed. Normally when someone does something in a hurry, recklessness is kind of implied anyways.
If anything, I'd say Careful Synthesis is more misleading than Bold Synthesis. When I think of doing something carefully, I imagine it to have the least rate of failure. And that is certainly not the case, from what I can tell.